Mosquitoes can spread the flesh-eating Buruli ulcer. Here’s how you can protect yourself

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Each year, more and more Victorians become sick with a flesh-eating bacteria known as Buruli ulcer. Last year, 363 people presented with the infection, the highest number since 2004.

But it has been unclear exactly how it spreads, until now. New research shows mosquitoes are infected from biting possums that carry the bacteria. Mozzies spread it to humans through their bite.

What is Buruli ulcer?

Buruli ulcer, also known as Bairnsdale ulcer, is a skin infection caused by the bacterium Mycobacterium ulcerans.

It starts off like a small mosquito bite and over many months, slowly develops into an ulcer, with extensive destruction of the underlying tissue.

While often painless initially, the infection can become very serious. If left untreated, the ulcer can continue to enlarge. This is where it gets its “flesh-eating” name.

Thankfully, it’s treatable. A six to eight week course of specific antibiotics is an effective treatment, sometimes supported with surgery to remove the infected tissue.

Where can you catch it?

The World Health Organization considers Buruli ulcer a neglected tropical skin disease. Cases have been reported across 33 countries, primarily in west and central Africa.

However, since the early 2000s, Buruli ulcer has also been increasingly recorded in coastal Victoria, including suburbs around Melbourne and Geelong.

Scientists have long known Australian native possums were partly responsible for its spread, and suspected mosquitoes also played a role in the increase in cases. New research confirms this.

Our efforts to ‘beat Buruli’

Confirming the role of insects in outbreaks of an infectious disease is achieved by building up corroborating, independent evidence.

In this new research, published in Nature Microbiology, the team (including co-authors Tim Stinear, Stacey Lynch and Peter Mee) conducted extensive surveys across a 350 km² area of Victoria.

We collected mosquitoes and analysed the specimens to determine whether they were carrying the pathogen, and links to infected possums and people. It was like contact tracing for mosquitoes.

Dead mosquito specimen in museum collection
Aedes notoscriptus was the mosquito identified as carrying the bacteria that caused Buruli ulcer.
Cameron Webb (NSW Health Pathology)

Molecular testing of the mosquito specimens showed that of the two most abundant mosquito species, only Aedes notoscriptus (a widespread species commonly known as the Australian backyard mosquito) was positive for Mycobacterium ulcerans.

We then used genomic tests to show the bacteria found on these mosquitoes matched the bacteria in possum poo and humans with Buruli ulcer.

We further analysed mosquito specimens that contained blood to show Aedes notoscriptus was feeding on both possums and humans.

To then link everything together, geospatial analysis revealed the areas where human Buruli ulcer cases occur overlap with areas where both mosquitoes and possums that harbour Mycobacterium ulcerans are active.

Stop its spread by stopping mozzies breeding

The mosquito in this study primarily responsible for the bacteria’s spread is Aedes notoscriptus, a mosquito that lays its eggs around water in containers in backyard habitats.

Controlling “backyard” mosquitoes is a critical part of reducing the risk of many global mosquito-borne disease, especially dengue and now Buruli ulcer.

You can reduce places where water collects after rainfall, such as potted plant saucers, blocked gutters and drains, unscreened rainwater tanks, and a wide range of plastic buckets and other containers. These should all be either emptied at least weekly or, better yet, thrown away or placed under cover.

A watering can sitting in garden and filled with water
Mosquitoes can lay eggs in a wide range of water-filled items in the backyard.
Cameron Webb (NSW Health Pathology)

There is a role for insecticides too. While residual insecticides applied to surfaces around the house and garden will reduce mosquito populations, they can also impact other, beneficial, insects. Judicious use of such sprays is recommended. But there are ecological safe insecticides that can be applied to water-filled containers (such as ornamental ponds, fountains, stormwater pits and so on).

Recent research also indicates new mosquito-control approaches that use mosquitoes themselves to spread insecticides may soon be available.

How to protect yourself from bites

The first line of defence will remain personal protection measures against mosquito bites.

Covering up with loose fitted long sleeved shirts, long pants, and covered shoes will provide physical protection from mosquitoes.

Applying topical insect repellent to all exposed areas of skin has been proven to provide safe and effective protection from mosquito bites. Repellents should include diethytolumide (DEET), picaridin or oil of lemon eucalyptus.

While the rise in Buruli ulcer is a significant health concern, so too are many other mosquito-borne diseases. The steps to avoid mosquito bites and exposure to Mycobacteriam ulcerans will also protect against viruses such as Ross River, Barmah Forest, Japanese encephalitis, and Murray Valley encephalitis.The Conversation

Cameron Webb, Clinical Associate Professor and Principal Hospital Scientist, University of Sydney; Peter Mee, Adjunct Associate Lecturer, School of Applied Systems Biology, La Trobe University; Stacey Lynch, Team Leader- Mammalian infection disease research, CSIRO, and Tim Stinear, Professor of Microbiology, The University of Melbourne

This article is republished from The Conversation under a Creative Commons license. Read the original article.

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  • Improve Your Insulin Sensitivity!

    10almonds is reader-supported. We may, at no cost to you, receive a portion of sales if you purchase a product through a link in this article.

    We’ve written before about blood sugar management, for example:

    10 Ways To Balance Blood Sugars ← this one really is the most solid foundation possible; if you do nothing else, do these 10 things!

    And as for why we care:

    Good (Or Bad) Health Starts With Your Blood

    …because the same things that cause type 2 diabetes, go on to cause many other woes, with particularly strong comorbidities in the case of Alzheimer’s disease and other dementias, as well as heart disease of various kinds, and a long long laundry list of immune dysfunctions / inflammatory disorders in general.

    In short, if you can’t keep your blood sugars even, the rest of your health will fall like so many dominoes.

    Getting a baseline

    Are you counting steps? Counting calories? Monitoring your sleep? Heart rate zones? These all have their merits:

    But something far fewer people do unless they have diabetes or are very enthusiastic about personal health, is to track blood sugars:

    Here’s how: Track Your Blood Sugars For Better Personalized Health

    And for understanding some things to watch out for when using a continuous glucose monitor:

    Continuous Glucose Monitors Without Diabetes: Pros & Cons

    Writer’s anecdote: I decided to give one a try for a few months, and so far it has been informative, albeit unexciting. It seems that with my diet (mostly whole-foods plant based, though I do have a wholegrain wheat product about twice per week (usually: flatbread once, pasta once) which is… Well, we could argue it’s whole-food plant based, but let’s be honest, it’s a little processed), my blood sugars don’t really have spikes at all; the graph looks more like gently rolling low hills (which is good). However! Even so, by experimenting with it, I can see for myself what differences different foods/interventions make to my blood sugars, which is helpful, and it also improves my motivation for intermittent fasting. It also means that if I think “hmm, my energy levels are feeling low; I need a snack” I can touch my phone to my arm and find out if that is really the reason (so far, it hasn’t been). I expect that as I monitor my blood sugars continuously and look at the data frequently, I’ll start to get a much more intuitive feel for my own blood sugars, in much the same way I can generally intuit my hormone levels correctly after years of taking-and-testing.

    So much for blood sugars. Now, what about insulin?

    Step Zero

    If taking care of blood sugars is step one, then taking care of insulin is step zero.

    Often’s it’s viewed the other way around: we try to keep our blood sugars balanced, to reduce the need for our bodies to produce so much insulin that it gets worn out. And that’s good and fine, but…

    To quote what we wrote when reviewing “Why We Get Sick” last month:

    ❝Dr. Bikman makes the case that while indeed hyper- or hypoglycemia bring their problems, mostly these are symptoms rather than causes, and the real culprit is insulin resistance, and this is important for two main reasons:

    1. Insulin resistance occurs well before the other symptoms set in (which means: it is the thing that truly needs to be nipped in the bud; if your fasting blood sugars are rising, then you missed “nipping it in the bud” likely by a decade or more)
    2. Insulin resistance causes more problems than “mere” hyperglycemia (the most commonly-known result of insulin resistance) does, so again, it really needs to be considered separately from blood sugar management.

    This latter, Dr. Bikman goes into in great detail, linking insulin resistance (even if blood sugar levels are normal) to all manner of diseases (hence the title).

    You may be wondering: how can blood sugar levels be normal, if we have insulin resistance?

    And the answer is that for as long as it is still able, your pancreas will just faithfully crank out more and more insulin to deal with the blood sugar levels that would otherwise be steadily rising. Since people measure blood sugar levels much more regularly than anyone checks for actual insulin levels, this means that one can be insulin resistant for years without knowing it, until finally the pancreas is no longer able to keep up with the demand—then that’s when people finally notice.❞

    You can read the full book review here:

    Why We Get Sick: The Hidden Epidemic at the Root of Most Chronic Disease and How to Fight It – by Dr. Benjamin Bikman

    Now, testing for insulin is not so quick, easy, or accessible as testing for glucose, but it can be worthwhile to order such a test—because, as discussed, your insulin levels could be high even while your blood sugars are still normal, and it won’t be until the pancreas finally reaches breaking point that your blood sugars show it.

    So, knowing your insulin levels can help you intervene before your pancreas reaches that breaking point.

    We can’t advise on local services available for ordering blood tests (because they will vary depending on location), but a simple Google search should suffice to show what’s available in your region.

    Once you know your insulin levels (or even if you don’t, but simply take the principled position that improving insulin sensitivity will be good regardless), you can set about managing them.

    Insulin sensitivity is important, because the better it is (higher insulin sensitivity), the less insulin the pancreas has to make to tidy up the same amount of glucose into places that are good for it to go—which is good. In contrast, the worse it is (higher insulin resistance), the more insulin the pancreas has to make to do the same blood sugar management. Which is bad.

    What to do about it

    We imagine you will already be eating in a way that is conducive to avoiding or reversing type 2 diabetes, but for anyone who wants a refresher,

    See: How To Prevent And Reverse Type 2 Diabetes

    …which yes, as well as meaning eating/avoiding certain foods, does recommend intermittent fasting. For anyone who wants a primer on that,

    See: Intermittent Fasting: Methods & Benefits

    There are also drugs you may want to consider:

    Metformin Without Diabetes, For Weight-Loss & More

    And “nutraceuticals” that sound like drugs, for example:

    Glutathione’s Benefits: The Usual And The Unique ← the good news is, it’s found in several common foods

    You may have heard the hype about “nature’s Ozempic”, and berberine isn’t exactly that (works in mostly different ways), but its benefits do include improving insulin sensitivity:

    Berberine For Metabolic Health

    Lastly, while eating for blood sugar management is all well and good, do be aware that some things affect insulin levels without increased blood sugar levels. So even if you’re using a CGM, you may go blissfully unaware of an insulin spike, because there was no glucose spike on the graph—and in contrast, there could even be a dip in blood sugar levels, if you consumed something that increased insulin levels without providing glucose at the same time, making you think “I should have some carbs”, which visually on the graph would even out your blood sugars, but invisibly, would worsen the already-extant insulin spike.

    Read more about this: Strange Things Happening In The Islets Of Langerhans: When Carbs, Proteins, & Fats Switch Metabolic Roles

    Now, since you probably can’t test your insulin at a moment’s notice, the way to watch out for this is “hmm, I ate some protein/fats (delete as applicable) without carbs and my blood sugars dipped; I know what’s going on here”.

    Want to know more?

    We heartily recommend the “Why We Get Sick” book we linked above, as this focuses on insulin resistance/sensitivity itself!

    However, a very good general primer on blood sugar management (and thus, by extension, at least moderately good insulin management), is:

    Glucose Revolution: The Life-Changing Power of Balancing Your Blood Sugar – by Jessie Inchauspé

    Enjoy!

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  • How Useful Is Peppermint, Really?

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    Peppermint For Digestion & Against Nausea

    Peppermint is often enjoyed to aid digestion, and sometimes as a remedy for nausea, but what does the science say about these uses?

    Peppermint and digestion

    In short: it works! (but beware)

    Most studies on peppermint and digestion, that have been conducted with humans, have been with regard to IBS, but its efficacy seems quite broad:

    ❝Peppermint oil is a natural product which affects physiology throughout the gastrointestinal tract, has been used successfully for several clinical disorders, and appears to have a good safety profile.❞

    ~ Dr. Chumpitazi et al.

    Read more: The physiologic effects and safety of Peppermint Oil and its efficacy in irritable bowel syndrome and other functional disorders

    However, and this is important: if your digestive problem is GERD, then you may want to skip it:

    ❝The univariate logistic regression analysis showed the following risk factors: eating 1–2 meals per day (OR = 3.50, 95% CI: 1.75–6.98), everyday consumption of peppermint tea (OR = 2.00, 95% CI: 1.14–3.50), and eating one, big meal in the evening instead of dinner and supper (OR = 1.80, 95% CI: 1.05–3.11).

    The multivariate analysis confirmed that frequent peppermint tea consumption was a risk factor (OR = 2.00, 95% CI: 1.08–3.70).❞

    ~ Dr. Jarosz & Dr. Taraszewska

    Source: Risk factors for gastroesophageal reflux disease: the role of diet

    Peppermint and nausea

    Peppermint is also sometimes recommended as a nausea remedy. Does it work?

    The answer is: maybe

    The thing with nausea is it is a symptom with a lot of possible causes, so effectiveness of remedies may vary. But for example:

    Summary

    Peppermint is useful against wide variety of gastrointestinal disorders, including IBS, but very definitely excluding GERD (in the case of GERD, it may make things worse)

    Peppermint may help with nausea, depending on the cause.

    Where can I get some?

    Peppermint tea, and peppermint oil, you can probably find in your local supermarket (as well as fresh mint leaves, perhaps).

    For the “heavy guns” that is peppermint essential oil, here’s an example product on Amazon for your convenience

    Enjoy!

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  • The Epigenetics Revolution – by Dr. Nessa Carey

    10almonds is reader-supported. We may, at no cost to you, receive a portion of sales if you purchase a product through a link in this article.

    If you enjoyed the book “Inheritance” that we reviewed a couple of days ago, you might love this as a “next read” book. But you can also just dive straight in here, if you like!

    This one, as the title suggests, focuses entirely on epigenetics—how our life events can shape our genetic expression, and that of our descendants. Or to look at it in the other direction, how our genetic expression can be shaped by the life experiences of, for example, our grandparents.

    The style of this book is very much pop-science, but contains a lot of information from hard science throughout. We learn not just about longitudinal population studies as one might expect, but also about the intricacies of DNA methylation and histone modifications, for example.

    Depending on your outlook, you may find some of this very bleak (“great, I am shackled by what my grandparents did”) or very optimism-inducing (“oh wow, I’m not nearly so constrained by genetics as I thought; this stuff is so malleable!”). This is also the same author who wrote “Hacking The Code of Life“, by the way, but we’ll review that another day.

    Bottom line: this book is the best one-shot primer on epigenetics that this reviewer has read (you may be wondering how many that is, and the answer is… about seven or so? I’m not good at counting).

    Click here to check out The Epigenetics Revolution, and learn how dynamic you really are!

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Related Posts

  • Why does alcohol make my poo go weird?
  • Signs Of Low Estrogen In Women: What Your Skin, Hair, & Nails Are Trying To Tell You

    10almonds is reader-supported. We may, at no cost to you, receive a portion of sales if you purchase a product through a link in this article.

    Skin, hair, and nails are often thought of purely as a beauty thing, but in fact they can be indicative of a lot of other aspects of health. Dr. Andrea Suarez takes us through some of them in this video about the systemic (i.e., whole-body, not just related to sex things) effects of estrogen, and/or a deficiency thereof.

    Beyond the cosmetic

    Low estrogen levels are usual in women during and after untreated menopause, resulting in various changes in the skin, hair, and nails, that reflect deeper issues, down to bone health, heart health, brain health, and more. Since we can’t see our bones or hearts or brains without scans (or a serious accident/incident), we’re going to focus on the outward signs of estrogen deficiency.

    Estrogen helps maintain healthy collagen production, skin elasticity, wound healing, and moisture retention, making it essential for youthful and resilient skin. Declining estrogen levels with menopause lead to a thinner epidermis, decreased collagen production, and more pronounced wrinkles. Skin elasticity also diminishes, which slows the skin’s ability to recover from stretching or deformation. Wound healing also becomes slower, increasing the risk of infections and extended recovery periods after injuries or surgeries—bearing in mind that collagen is needed in everything from our skin to our internal connective tissue (fascia) and joints and bones. So all those things are going to struggle to recover from injury (and surgery is also an injury) without it.

    Other visible changes associated with declining estrogen include significant dryness as a result of reduced hyaluronic acid and glycosaminoglycan production, which are essential for moisture retention. The skin becomes more prone to irritation and increased water loss. Additionally, estrogen deficiency results in less resistance to oxidative stress, making the skin more susceptible to damage from environmental factors such as UV radiation and pollution, as well as any from-the-inside pollution that some may have depending on diet and lifestyle.

    Acne and enlarged pores are associated with increased testosterone, but testosterone and estrogen are antagonistic in most ways, and in this case a decrease in estrogen will do the same, due increased unopposed androgen signaling affecting the oil glands. The loss of supportive collagen also causes the skin around pores to lose structure, making them appear larger. The reduction in skin hydration further exacerbates the visibility of pores and can contribute to the development of blackheads due to abnormal cell turnover.

    Blood vessel issues tend to arise as estrogen levels drop, leading to a reduction in angiogenesis, i.e. the formation and integrity of blood vessels. This results in more fragile and leaky blood vessels, making the skin more prone to bruising, especially on areas frequently exposed to the sun, such as the backs of the hands. This weakened vasculature also further contributes to the slower wound healing that we talked about, due to less efficient delivery of growth factors.

    Hair and nail changes often accompany estrogen deficiency. Women may notice hair thinning, increased breakage, and a greater likelihood of androgenic alopecia. The texture of the hair can change, becoming more brittle. Similarly, nails can develop ridges, split more easily, and become more fragile due to reduced collagen and keratin production, which also affects the skin around the nails.

    As for what to do about it? Management options for estrogen-deficient skin include:

    • Bioidentical hormone replacement therapy (HRT), which can improve skin elasticity, boost collagen production, and reduce dryness and fragility, as well as addressing the many more serious internal things that are caused by the same deficiency as these outward signs.
    • Low-dose topical estrogen cream, which can help alleviate skin dryness and increase skin strength, won’t give the systemic benefits (incl. to bones, heart, brain, etc) that only systemic HRT can yield.
    • Plant-based phytoestrogens, which are not well-evidenced, but may be better than nothing if nothing is your only other option. However, if you are taking anything other form of estrogen, don’t use phytoestrogens as well, or they will compete for estrogen receptors, and do the job not nearly so well while impeding the bioidentical estrogen from doing its much better job.

    And for all at any age, sunscreen continues to be one of the best things to put on one’s skin for general skin health, and this is even more true if running low on estrogen.

    For more on all of this, enjoy:

    Click Here If The Embedded Video Doesn’t Load Automatically!

    Want to learn more?

    You might also like:

    These Signs Often Mean These Nutrient Deficiencies (Do You Have Any?)

    Take care!

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  • Level-Up Your Fiber Intake! (Without Difficulty Or Discomfort)

    10almonds is reader-supported. We may, at no cost to you, receive a portion of sales if you purchase a product through a link in this article.

    Why You’re Probably Not Getting Enough Fiber (And How To Fix It)

    First things first… How much fiber should we be eating?

    *This one is also a great read to understand more about the “why” of fiber

    Meanwhile, the average American gets 16g of fiber per day.

    So, how to get more fiber, without piling on too many carbs?

    Foods that contain fiber generally contain carbs (there’s a limit to how much celery most people want to eat), so there are two key ideas here:

    • Getting a good carb:fiber ratio
    • Making substitutions that boost fiber without overdoing (or in some case, even changing) carbs

    Meat → Lentils

    Well-seasoned lentils can be used to replaced ground beef or similar. A cup of boiled lentils contains 18g of fiber, so you’re already outdoing the average American’s daily total.

    Meat → Beans

    Black beans are a top-tier option here (15g per cup, cooked weight), but many kinds of beans are great.

    Chicken/Fish → Chickpeas

    Yes, chicken/fish is already meat, but we’re making a case for chickpeas here. Cooked and seasoned appropriately, they do the job, and pack in 12g of fiber per cup. Also… Hummus!

    Bonus: Hummus, eaten with celery sticks.

    White pasta/bread → Wholewheat pasta/bread

    This is one where “moderation is key”, but if you’re going to eat pasta/bread, then wholewheat is the way to go. Fiber amounts vary, so read labels, but it will always have far more than white.

    Processed salty snacks → Almonds and other nuts

    Nuts in general are great, but almonds are top-tier for fiber, amongst other things. A 40g handful of almonds contains about 10g of fiber.

    Starchy vegetables → Non-starchy vegetables

    Potatoes, parsnips, and their friends have their place. But they cannot compete with broccoli, peas, cabbage, and other non-starchy vegetables for fiber content.

    Bonus: if you’re going to have starchy vegetables though, leave the skins on!

    Fruit juice → Fruit

    Fruit juice has had most, if not all, of its fiber removed. Eat an actual juicy fruit, instead. Apples and bananas are great options; berries such as blackberries and raspberries are even better (at around 8g per cup, compared to the 5g or so depending on the size of an apple/banana)

    Processed cereals → Oats

    5g fiber per cup. Enough said.

    Summary

    Far from being a Herculean task, getting >30g of fiber per day can be easily accomplished by a lentil ragù with wholewheat pasta.

    If your breakfast is overnight oats with fruit and some chopped almonds, you can make it to >20g already by the time you’ve finished your first meal of the day.

    Enjoy!

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  • The Minerals That Neutralize Viruses (While Being Harmless To Humans)

    10almonds is reader-supported. We may, at no cost to you, receive a portion of sales if you purchase a product through a link in this article.

    Researchers in Estonia and Sweden (it was a joint project, with five researchers from each country) have found a way to use titanium dioxide nanoparticles to neutralize viruses, including COVID & flu.

    Titanium dioxide, yes, the common additive to foods, cosmetics, and more (in most cases, added as a non-bleaching whitening agent—simply, titanium dioxide is body-safe, white in color, and very reflective, making it a brilliant, shiny white). Also used in sunscreens, for its excellent safety profile and again, its full-spectrum reflectiveness.

    See also: Who Screens The Sunscreens?

    How it works

    Some viruses, including coronaviruses and influenza viruses, have an outer layer that’s a lipid membrane. The researchers found (by testing against multiple viruses, and by using a control of silicotungstate polyoxymethalate nanoparticles), that the ability of titanium dioxide to bind to phospholipids (and ability that the silicotungstate polyoxymethalate doesn’t have) means that the nanoparticles bind to the virus’s outer case, thus preventing it from effectively entering human cells (which it needs to do in order to infect the host, as this is how viruses replicate themselves).

    What this means, in practical terms

    While more research will be needed to know whether this can be used in the medicinal sense, it already means that a nanoparticle spray can be used to create virus-neutralizing layers on surfaces and in air filters. This alone could greatly reduce transmission in enclosed spaces such as public transport (ranging from taxis to airplanes), as well as other places where people get packed into a small space.

    If you have an air purifier at home, keep an eye out for when improved filters arrive on the market!

    See also: What’s Lurking In Your Household Air?

    Wait, you said “minerals”; are there more?

    It seems so, but we can’t truly say for sure until they’ve been tested. However, the researchers see no reason why other small metal oxides that bind strongly to phospholipids shouldn’t work exactly the same way—which would include iron oxide (yes, as in rust) and aluminum oxide (the coating that automatically forms immediately when aluminum is exposed to oxygen (aluminum is so reactive to oxygen, that it’s almost impossible to get aluminum without an oxidized surface, unless you use something else to coat it, or cut it in an oxygen-free atmosphere and keep it there).

    You can read the paper itself here:

    Molecular mechanisms behind the anti corona virus activity of small metal oxide nanoparticles

    And on a related note (different scientists, different science, similar principle, though, using mineral nanotechnology to kill microbes):

    ❝Researchers report that laboratory tests of their nanoflower-coated dressings demonstrate antibiotic, anti-inflammatory and biocompatible properties. They say these results show these tannic acid and copper(II) phosphate sprouted nanoflower bandages are promising candidates for treating infections and inflammatory conditions.❞

    Read in full: This delicate nanoflower is downright deadly to bacteria

    Want to learn more?

    Check out:

    Move over, COVID and Flu! We Have “Hybrid Viruses” To Contend With Now

    Take care!

    Don’t Forget…

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