A person in Texas caught bird flu after mixing with dairy cattle. Should we be worried?
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The United States’ Centers for Disease Control and Prevention (CDC) has issued a health alert after the first case of H5N1 avian influenza, or bird flu, seemingly spread from a cow to a human.
A farm worker in Texas contracted the virus amid an outbreak in dairy cattle. This is the second human case in the US; a poultry worker tested positive in Colorado in 2022.
The virus strain identified in the Texan farm worker is not readily transmissible between humans and therefore not a pandemic threat. But it’s a significant development nonetheless.
Some background on bird flu
There are two types of avian influenza: highly pathogenic or low pathogenic, based on the level of disease the strain causes in birds. H5N1 is a highly pathogenic avian influenza.
H5N1 first emerged in 1997 in Hong Kong and then China in 2003, spreading through wild bird migration and poultry trading. It has caused periodic epidemics in poultry farms, with occasional human cases.
Influenza A viruses such as H5N1 are further divided into variants, called clades. The unique variant causing the current epidemic is H5N1 clade 2.3.4.4b, which emerged in late 2020 and is now widespread globally, especially in the Americas.
In the past, outbreaks could be controlled by culling of infected birds, and H5N1 would die down for a while. But this has become increasingly difficult due to escalating outbreaks since 2021.
Wild animals are now in the mix
Waterfowl (ducks, swans and geese) are the main global spreaders of avian flu, as they migrate across the world via specific routes that bypass Australia. The main hub for waterfowl to migrate around the world is Quinghai lake in China.
But there’s been an increasing number of infected non-waterfowl birds, such as true thrushes and raptors, which use different flyways. Worryingly, the infection has spread to Antarctica too, which means Australia is now at risk from different bird species which fly here.
H5N1 has escalated in an unprecedented fashion since 2021, and an increasing number of mammals including sea lions, goats, red foxes, coyotes, even domestic dogs and cats have become infected around the world.
Wild animals like red foxes which live in peri-urban areas are a possible new route of spread to farms, domestic pets and humans.
Dairy cows and goats have now become infected with H5N1 in at least 17 farms across seven US states.
What are the symptoms?
Globally, there have been 14 cases of H5N1 clade 2.3.4.4b virus in humans, and 889 H5N1 human cases overall since 2003.
Previous human cases have presented with a severe respiratory illness, but H5N1 2.3.4.4b is causing illness affecting other organs too, like the brain, eyes and liver.
For example, more recent cases have developed neurological complications including seizures, organ failure and stroke. It’s been estimated that around half of people infected with H5N1 will die.
The case in the Texan farm worker appears to be mild. This person presented with conjunctivitis, which is unusual.
Food safety
Contact with sick poultry is a key risk factor for human infection. Likewise, the farm worker in Texas was likely in close contact with the infected cattle.
The CDC advises pasteurised milk and well cooked eggs are safe. However, handling of infected meat or eggs in the process of cooking, or drinking unpasteurised milk, may pose a risk.
Although there’s no H5N1 in Australian poultry or cattle, hygienic food practices are always a good idea, as raw milk or poorly cooked meat, eggs or poultry can be contaminated with microbes such as salmonella and E Coli.
If it’s not a pandemic, why are we worried?
Scientists have feared avian influenza may cause a pandemic since about 2005. Avian flu viruses don’t easily spread in humans. But if an avian virus mutates to spread in humans, it can cause a pandemic.
One concern is if birds were to infect an animal like a pig, this acts as a genetic mixing vessel. In areas where humans and livestock exist in close proximity, for example farms, markets or even in homes with backyard poultry, the probability of bird and human flu strains mixing and mutating to cause a new pandemic strain is higher.
The cows infected in Texas were tested because farmers noticed they were producing less milk. If beef cattle are similarly affected, it may not be as easily identified, and the economic loss to farmers may be a disincentive to test or report infections.
How can we prevent a pandemic?
For now there is no spread of H5N1 between humans, so there’s no immediate risk of a pandemic.
However, we now have unprecedented and persistent infection with H5N1 clade 2.3.4.4b in farms, wild animals and a wider range of wild birds than ever before, creating more chances for H5N1 to mutate and cause a pandemic.
Unlike the previous epidemiology of avian flu, where hot spots were in Asia, the new hot spots (and likely sites of emergence of a pandemic) are in the Americas, Europe or in Africa.
Pandemics grow exponentially, so early warnings for animal and human outbreaks are crucial. We can monitor infections using surveillance tools such as our EPIWATCH platform.
The earlier epidemics can be detected, the better the chance of stamping them out and rapidly developing vaccines.
Although there is a vaccine for birds, it has been largely avoided until recently because it’s only partially effective and can mask outbreaks. But it’s no longer feasible to control an outbreak by culling infected birds, so some countries like France began vaccinating poultry in 2023.
For humans, seasonal flu vaccines may provide a small amount of cross-protection, but for the best protection, vaccines need to be matched exactly to the pandemic strain, and this takes time. The 2009 flu pandemic started in May in Australia, but the vaccines were available in September, after the pandemic peak.
To reduce the risk of a pandemic, we must identify how H5N1 is spreading to so many mammalian species, what new wild bird pathways pose a risk, and monitor for early signs of outbreaks and illness in animals, birds and humans. Economic compensation for farmers is also crucial to ensure we detect all outbreaks and avoid compromising the food supply.
C Raina MacIntyre, Professor of Global Biosecurity, NHMRC L3 Research Fellow, Head, Biosecurity Program, Kirby Institute, UNSW Sydney; Ashley Quigley, Senior Research Associate, Global Biosecurity, UNSW Sydney; Haley Stone, PhD Candidate, Biosecurity Program, Kirby Institute, UNSW Sydney; Matthew Scotch, Associate Dean of Research and Professor of Biomedical Informatics, College of Health Solutions, Arizona State University, and Rebecca Dawson, Research Associate, The Kirby Institute, UNSW Sydney
This article is republished from The Conversation under a Creative Commons license. Read the original article.
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What happens to your vagina as you age?
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The vagina is an internal organ with a complex ecosystem, influenced by circulating hormone levels which change during the menstrual cycle, pregnancy, breastfeeding and menopause.
Around and after menopause, there are normal changes in the growth and function of vaginal cells, as well as the vagina’s microbiome (groups of bacteria living in the vagina). Many women won’t notice these changes. They don’t usually cause symptoms or concern, but if they do, symptoms can usually be managed.
Here’s what happens to your vagina as you age, whether you notice or not.
Let’s clear up the terminology
We’re focusing on the vagina, the muscular tube that goes from the external genitalia (the vulva), past the cervix, to the womb (uterus). Sometimes the word “vagina” is used to include the external genitalia. However, these are different organs and play different roles in women’s health.
What happens to the vagina as you age?
Like many other organs in the body, the vagina is sensitive to female sex steroid hormones (hormones) that change around puberty, pregnancy and menopause.
Menopause is associated with a drop in circulating oestrogen concentrations and the hormone progesterone is no longer produced. The changes in hormones affect the vagina and its ecosystem. Effects may include:
- less vaginal secretions, potentially leading to dryness
- less growth of vagina surface cells resulting in a thinned lining
- alteration to the support structure (connective tissue) around the vagina leading to less elasticity and more narrowing
- fewer blood vessels around the vagina, which may explain less blood flow after menopause
- a shift in the type and balance of bacteria, which can change vaginal acidity, from more acidic to more alkaline.
What symptoms can I expect?
Many women do not notice any bothersome vaginal changes as they age. There’s also little evidence many of these changes cause vaginal symptoms. For example, there is no direct evidence these changes cause vaginal infection or bleeding in menopausal women.
Some women notice vaginal dryness after menopause, which may be linked to less vaginal secretions. This may lead to pain and discomfort during sex. But it’s not clear how much of this dryness is due to menopause, as younger women also commonly report it. In one study, 47% of sexually active postmenopausal women reported vaginal dryness, as did around 20% of premenopausal women.
Other organs close to the vagina, such as the bladder and urethra, are also affected by the change in hormone levels after menopause. Some women experience recurrent urinary tract infections, which may cause pain (including pain to the side of the body) and irritation. So their symptoms are in fact not coming from the vagina itself but relate to changes in the urinary tract.
Not everyone has the same experience
Women vary in whether they notice vaginal changes and whether they are bothered by these to the same extent. For example, women with vaginal dryness who are not sexually active may not notice the change in vaginal secretions after menopause. However, some women notice severe dryness that affects their daily function and activities.
In fact, researchers globally are taking more notice of women’s experiences of menopause to inform future research. This includes prioritising symptoms that matter to women the most, such as vaginal dryness, discomfort, irritation and pain during sex.
If symptoms bother you
Symptoms such as dryness, irritation, or pain during sex can usually be effectively managed. Lubricants may reduce pain during sex. Vaginal moisturisers may reduce dryness. Both are available over-the-counter at your local pharmacy.
While there are many small clinical trials of individual products, these studies lack the power to demonstrate if they are really effective in improving vaginal symptoms.
In contrast, there is robust evidence that vaginal oestrogen is effective in treating vaginal dryness and reducing pain during sex. It also reduces your chance of recurrent urinary tract infections. You can talk to your doctor about a prescription.
Vaginal oestrogen is usually inserted using an applicator, two to three times a week. Very little is absorbed into the blood stream, it is generally safe but longer-term trials are required to confirm safety in long-term use beyond a year.
Women with a history of breast cancer should see their oncologist to discuss using oestrogen as it may not be suitable for them.
Are there other treatments?
New treatments for vaginal dryness are under investigation. One avenue relates to our growing understanding of how the vaginal microbiome adapts and modifies around changes in circulating and local concentrations of hormones.
For example, a small number of reports show that combining vaginal probiotics with low-dose vaginal oestrogen can improve vaginal symptoms. But more evidence is needed before this is recommended.
Where to from here?
The normal ageing process, as well as menopause, both affect the vagina as we age.
Most women do not have troublesome vaginal symptoms during and after menopause, but for some, these may cause discomfort or distress.
While hormonal treatments such as vaginal oestrogen are available, there is a pressing need for more non-hormonal treatments.
Dr Sianan Healy, from Women’s Health Victoria, contributed to this article.
Louie Ye, Clinical Fellow, Department of Obstetrics and Gynecology, The University of Melbourne and Martha Hickey, Professor of Obstetrics and Gynaecology, The University of Melbourne
This article is republished from The Conversation under a Creative Commons license. Read the original article.
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‘I keep away from people’ – combined vision and hearing loss is isolating more and more older Australians
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Our ageing population brings a growing crisis: people over 65 are at greater risk of dual sensory impairment (also known as “deafblindness” or combined vision and hearing loss).
Some 66% of people over 60 have hearing loss and 33% of older Australians have low vision. Estimates suggest more than a quarter of Australians over 80 are living with dual sensory impairment.
Combined vision and hearing loss describes any degree of sight and hearing loss, so neither sense can compensate for the other. Dual sensory impairment can occur at any point in life but is increasingly common as people get older.
The experience can make older people feel isolated and unable to participate in important conversations, including about their health.
bricolage/Shutterstock Causes and conditions
Conditions related to hearing and vision impairment often increase as we age – but many of these changes are subtle.
Hearing loss can start as early as our 50s and often accompany other age-related visual changes, such as age-related macular degeneration.
Other age-related conditions are frequently prioritised by patients, doctors or carers, such as diabetes or heart disease. Vision and hearing changes can be easy to overlook or accept as a normal aspect of ageing. As an older person we interviewed for our research told us
I don’t see too good or hear too well. It’s just part of old age.
An invisible disability
Dual sensory impairment has a significant and negative impact in all aspects of a person’s life. It reduces access to information, mobility and orientation, impacts social activities and communication, making it difficult for older adults to manage.
It is underdiagnosed, underrecognised and sometimes misattributed (for example, to cognitive impairment or decline). However, there is also growing evidence of links between dementia and dual sensory loss. If left untreated or without appropriate support, dual sensory impairment diminishes the capacity of older people to live independently, feel happy and be safe.
A dearth of specific resources to educate and support older Australians with their dual sensory impairment means when older people do raise the issue, their GP or health professional may not understand its significance or where to refer them. One older person told us:
There’s another thing too about the GP, the sort of mentality ‘well what do you expect? You’re 95.’ Hearing and vision loss in old age is not seen as a disability, it’s seen as something else.
Isolated yet more dependent on others
Global trends show a worrying conundrum. Older people with dual sensory impairment become more socially isolated, which impacts their mental health and wellbeing. At the same time they can become increasingly dependent on other people to help them navigate and manage day-to-day activities with limited sight and hearing.
One aspect of this is how effectively they can comprehend and communicate in a health-care setting. Recent research shows doctors and nurses in hospitals aren’t making themselves understood to most of their patients with dual sensory impairment. Good communication in the health context is about more than just “knowing what is going on”, researchers note. It facilitates:
- shorter hospital stays
- fewer re-admissions
- reduced emergency room visits
- better treatment adherence and medical follow up
- less unnecessary diagnostic testing
- improved health-care outcomes.
‘Too hard’
Globally, there is a better understanding of how important it is to maintain active social lives as people age. But this is difficult for older adults with dual sensory loss. One person told us
I don’t particularly want to mix with people. Too hard, because they can’t understand. I can no longer now walk into that room, see nothing, find my seat and not recognise [or hear] people.
Again, these experiences increase reliance on family. But caring in this context is tough and largely hidden. Family members describe being the “eyes and ears” for their loved one. It’s a 24/7 role which can bring frustration, social isolation and depression for carers too. One spouse told us:
He doesn’t talk anymore much, because he doesn’t know whether [people are] talking to him, unless they use his name, he’s unaware they’re speaking to him, so he might ignore people and so on. And in the end, I noticed people weren’t even bothering him to talk, so now I refuse to go. Because I don’t think it’s fair.
Dual sensory loss can be isolating for older people and carers. Synthex/Shutterstock So, what can we do?
Dual sensory impairment is a growing problem with potentially devastating impacts.
It should be considered a unique and distinct disability in all relevant protections and policies. This includes the right to dedicated diagnosis and support, accessibility provisions and specialised skill development for health and social professionals and carers.
We need to develop resources to help people with dual sensory impairment and their families and carers understand the condition, what it means and how everyone can be supported. This could include communication adaptation, such as social haptics (communicating using touch) and specialised support for older adults to navigate health care.
Increasing awareness and understanding of dual sensory impairment will also help those impacted with everyday engagement with the world around them – rather than the isolation many feel now.
Moira Dunsmore, Senior Lecturer, Sydney Nursing School, Faculty of Medicine and Health, University of Sydney, University of Sydney; Annmaree Watharow, Lived Experience Research Fellow, Centre for Disability Research and Policy, University of Sydney, and Emily Kecman, Postdoctoral research fellow, Department of Linguistics, University of Sydney
This article is republished from The Conversation under a Creative Commons license. Read the original article.
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Heart Smarter for Women – by Dr. Jennifer Mieres
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Dr. Mieres takes us through understanding our own heart disease risks as individuals rather than as averages. As the title suggests, she does assume a female readership, so if you are a man and have no female loved ones, this might not be the book for you. But aside from that, she walks us through examining risk in the context of age, other health conditions, lifestyle factors, and so forth—including not turning a blind eye to factors that might intersect, such as for example if a physical condition reduces how much we can exercise, or if there’s some reason we can’t follow the usual gold standard of heart-healthy diet.
On which note, she does offer dietary advice, including information around recipes, meal-planning, and what things to always have in stock, as well as what things matter the most when it comes to what and how we eat.
It’s not all lifestyle medicine though; Dr. Mieres gives due attention to many of the medications available for heart health issues—and the pros and cons of these.
The style of the book is very simple and readable pop-science, without undue jargon, and with a generous glossary. As with many books of this genre, it does rely on (presumably apocryphal) anecdotes, though an interesting choice for this book is that it keeps a standing cast of four recurring characters, each to represent a set of circumstances and illustrate how certain things can go differently for different people, with different things then being needed and/or possible. Hopefully, any given reader will find themself represented at least moderately well somewhere in or between these four characters.
Bottom line: this is a very informative and accessible book, that demystifies a lot of common confusions around heart health.
Click here to check out Heart Smarter For Women, and take control of your health!
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Unfuck Your Brain – by Dr. Faith Harper
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This book takes a trauma-informed care approach, which is relatively novel in the mental health field and it’s quickly becoming the industry standard because of its effectiveness.
The basic premise of trauma-informed care is that you had a bad experience (possibly even more than one—what a thought!) and that things that remind you of that will tend to prompt reactivity from you in a way that probably isn’t healthy. By identifying each part of that process, we can then interrupt it, much like we might with CBT (the main difference being that CBT, for all its effectiveness, tends to assume that the things that are bothering you are not true, while TIC acknowledges that they might well be, and that especially historically, they probably were).
A word of warning: if something that triggers a trauma-based reactivity response in you is people swearing, then this book will either cure you by exposure therapy or leave you a nervous wreck, because it’s not just the title; Dr. Harper barely gets through a sentence without swearing. It’s a lot, even by this (European) reviewer’s standards (we’re a lot more relaxed about swearing over here, than people tend to be in America).
On the other hand, something that Dr. Harper excels at is actually explaining stuff very well. So while it sometimes seems like she’s “trying too hard” style-wise in terms of being “not like other therapists”, in her defence she’s nevertheless a very good writer; she knows her stuff, and knows how to communicate it clearly.
Bottom line: if you don’t mind a writer who swears more than 99% of soldiers, then this book is an excellent how-to guide for self-administered trauma-informed care.
Click here to check out Unfuck Your Brain, and indeed unfuck it!
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Science of HIIT – by Ingrid Clay
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We previously reviewed another book in this series, Science of Yoga. This one’s about HIIT: High Intensity Interval Training!
We’ve written about HIIT before too, but our article doesn’t have the same amount of room as a book, so…
This one lays out 90 key HIIT exercises that you can do at home without special equipment. By “without special equipment”, we mean: there are a few exercises that use dumbbells, but if you don’t want to get/use dumbbells, you can improvize (e.g. with water bottles as weights) or skip those. All the rest require just your body!
The illustrations are clear and the explanations excellent. The book also dives into (as the title promises) the science of HIIT, and why it works the way it does to give results that can’t be achieved with other forms of exercise.
Bottom line: if you’ve been wanting to do HIIT but have not yet found a way of doing it that suits your lifestyle, this book gives many excellent options.
Click here to check out Science of HIIT, and level-up yours!
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How Not to Age – by Dr. Michael Greger
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First things first: it’s a great book, and it’s this reviewer’s favorite of Dr. Greger’s so far (for posterity: it’s just been published and this reviewer has just finished reading the copy she got on pre-order)
Unlike many popular physician authors, Dr. Greger doesn’t rehash a lot of old material, and instead favours prioritizing new material in each work. Where appropriate, he’ll send the reader to other books for more specific information (e.g: you want to know how to avoid premature death? Go read How Not To Die. You want to know how to lose weight? How Not To Diet. Etc).
In the category of new information, he has a lot to offer here. And with over 8,000 references, it’s information, not conjecture. On which note, we recommend the e-book version if that’s possible for you, for three reasons:
- It’s possible to just click the references and be taken straight to the cited paper itself online
- To try to keep the book’s size down, Dr. Greger has linked to other external resources too
- The only negative reviews on Amazon, so far, are people complaining that the print copy’s text is smaller than they’d like
For all its information-density (those 8,000+ references are packed into 600ish pages), the book is very readable even to a lay reader; the author is a very skilled writer.
As for the content, we can’t fit more than a few sentences here so forgive the brevity, but we’ll mention that he covers:
- Slowing 11 pathways of aging
- The optimal anti-aging regimen according to current best science
- Preserving function (specific individual aspects of aging, e.g. hearing, sight, cognitive function, sexual function, hair, bones, etc)
- “Dr. Greger’s Anti-Aging Eight”
In terms of “flavor” of anti-aging science, his approach can be summed up as: diet and lifestyle as foundation; specific supplements and interventions as cornerstones.
Bottom line: this is now the anti-aging book.
Click here to check out How Not To Age, and look after yourself with the best modern science!
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