Enzo Palombo, Swinburne University of Technology

Recent outbreaks of bird flu – in US dairy herds, poultry farms in Australia and elsewhere, and isolated cases in humans – have raised the issue of food safety.

So can the virus transfer from infected farm animals to contaminate milk, meat or eggs? How likely is this?

And what do we need to think about to minimise our risk when shopping for or preparing food?

How safe is milk?

Bird flu (or avian influenza) is a bird disease caused by specific types of influenza virus. But the virus can also infect cows. In the US, for instance, to date more than 80 dairy herds in at least nine states have been infected with the H5N1 version of the virus.

Investigations are under way to confirm how this happened. But we do know infected birds can shed the virus in their saliva, nasal secretions and faeces. So bird flu can potentially contaminate animal-derived food products during processing and manufacturing.

Indeed, fragments of bird flu genetic material (RNA) were found in cow’s milk from the dairy herds associated with infected US farmers.

However, the spread of bird flu among cattle, and possibly to humans, is likely to have been caused through contact with contaminated milking equipment, not the milk itself.

The test used to detect the virus in milk – which uses similar PCR technology to lab-based COVID tests – is also highly sensitive. This means it can detect very low levels of the bird flu RNA. But the test does not distinguish between live or inactivated virus, just that the RNA is present. So from this test alone, we cannot tell if the virus found in milk is infectious (and capable of infecting humans).

Does that mean milk is safe to drink and won’t transmit bird flu? Yes and no.

In Australia, where bird flu has not been reported in dairy cattle, the answer is yes. It is safe to drink milk and milk products made from Australian milk.

In the US, the answer depends on whether the milk is pasteurised. We know pasteurisation is a common and reliable method of destroying concerning microbes, including influenza virus. Like most viruses, influenza virus (including bird flu virus) is inactivated by heat.

Although there is little direct research on whether pasteurisation inactivates H5N1 in milk, we can extrapolate from what we know about heat inactivation of H5N1 in chicken and eggs.

So we can be confident there is no risk of bird flu transmission via pasteurised milk or milk products.

However, it’s another matter for unpasteurised or “raw” US milk or milk products. A recent study showed mice fed raw milk contaminated with bird flu developed signs of illness. So to be on the safe side, it would be advisable to avoid raw milk products.

How about chicken?

Bird flu has caused sporadic outbreaks in wild birds and domestic poultry worldwide, including in Australia. In recent weeks, there have been three reported outbreaks in Victorian poultry farms (two with H7N3 bird flu, one with H7N9). There has been one reported outbreak in Western Australia (H9N2).

The strains of bird flu identified in the Victorian and Western Australia outbreaks can cause human infection, although these are rare and typically result from close contact with infected live birds or contaminated environments.

Therefore, the chance of bird flu transmission in chicken meat is remote.

Nonetheless, it is timely to remind people to handle chicken meat with caution as many dangerous pathogens, such as Salmonella and Campylobacter, can be found on chicken carcasses.

Always handle chicken meat carefully when shopping, transporting it home and storing it in the kitchen. For instance, make sure no meat juices cross-contaminate other items, consider using a cool bag when transporting meat, and refrigerate or freeze the meat within two hours.

Avoid washing your chicken before cooking to prevent the spread of disease-causing microbes around the kitchen.

Finally, cook chicken thoroughly as viruses (including bird flu) cannot survive cooking temperatures.

Are eggs safe?

The recent Australian outbreaks have occurred in egg-laying or mixed poultry flocks, so concerns have been raised about bird flu transmission via contaminated chicken eggs.

Can flu viruses contaminate chicken eggs and potentially spread bird flu? It appears so. A report from 2007 said it was feasible for influenza viruses to enter through the eggshell. This is because influenza virus particles are smaller (100 nanometres) than the pores in eggshells (at least 200 nm).

So viruses could enter eggs and be protected from cleaning procedures designed to remove microbes from the egg surface.

Therefore, like the advice about milk and meat, cooking eggs is best.

The US Food and Drug Administration recommends cooking poultry, eggs and other animal products to the proper temperature and preventing cross-contamination between raw and cooked food.

In a nutshell

If you consume pasteurised milk products and thoroughly cook your chicken and eggs, there is nothing to worry about as bird flu is inactivated by heat.

The real fear is that the virus will evolve into highly pathogenic versions that can be transmitted from human to human.

That scenario is much more frightening than any potential spread though food.

Enzo Palombo, Professor of Microbiology, Swinburne University of Technology

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

After several highly publicised alleged murders of women in Australia, the Albanese government this week pledged more than A$925 million over five years to address men’s violence towards women. This includes up to $5,000 to support those escaping violent relationships.

However, to reduce and prevent gender-based and intimate partner violence we also need to address the root causes and contributors. These include alcohol and other drugs, trauma and mental health issues.

Why is this crucial?

The World Health Organization estimates 30% of women globally have experienced intimate partner violence, gender-based violence or both. In Australia, 27% of women have experienced intimate partner violence by a co-habiting partner; almost 40% of Australian children are exposed to domestic violence.

By gender-based violence we mean violence or intentionally harmful behaviour directed at someone due to their gender. But intimate partner violence specifically refers to violence and abuse occurring between current (or former) romantic partners. Domestic violence can extend beyond intimate partners, to include other family members.

These statistics highlight the urgent need to address not just the aftermath of such violence, but also its roots, including the experiences and behaviours of perpetrators.

What’s the link with mental health, trauma and drugs?

The relationships between mental illness, drug use, traumatic experiences and violence are complex.

When we look specifically at the link between mental illness and violence, most people with mental illness will not become violent. But there is evidence people with serious mental illness can be more likely to become violent.

The use of alcohol and other drugs also increases the risk of domestic violence, including intimate partner violence.

About one in three intimate partner violence incidents involve alcohol. These are more likely to result in physical injury and hospitalisation. The risk of perpetrating violence is even higher for people with mental ill health who are also using alcohol or other drugs.

It’s also important to consider traumatic experiences. Most people who experience trauma do not commit violent acts, but there are high rates of trauma among people who become violent.

For example, experiences of childhood trauma (such as witnessing physical abuse) can increase the risk of perpetrating domestic violence as an adult.

Early traumatic experiences can affect the brain and body’s stress response, leading to heightened fear and perception of threat, and difficulty regulating emotions. This can result in aggressive responses when faced with conflict or stress.

This response to stress increases the risk of alcohol and drug problems, developing PTSD (post-traumatic stress disorder), and increases the risk of perpetrating intimate partner violence.

How can we address these overlapping issues?

We can reduce intimate partner violence by addressing these overlapping issues and tackling the root causes and contributors.

The early intervention and treatment of mental illness, trauma (including PTSD), and alcohol and other drug use, could help reduce violence. So extra investment for these are needed. We also need more investment to prevent mental health issues, and preventing alcohol and drug use disorders from developing in the first place.

Preventing trauma from occuring and supporting those exposed is crucial to end what can often become a vicious cycle of intergenerational trauma and violence. Safe and supportive environments and relationships can protect children against mental health problems or further violence as they grow up and engage in their own intimate relationships.

We also need to acknowledge the widespread impact of trauma and its effects on mental health, drug use and violence. This needs to be integrated into policies and practices to reduce re-traumatising individuals.

How about programs for perpetrators?

Most existing standard intervention programs for perpetrators do not consider the links between trauma, mental health and perpetrating intimate partner violence. Such programs tend to have little or mixed effects on the behaviour of perpetrators.

But we could improve these programs with a coordinated approach including treating mental illness, drug use and trauma at the same time.

Such “multicomponent” programs show promise in meaningfully reducing violent behaviour. However, we need more rigorous and large-scale evaluations of how well they work.

What needs to happen next?

Supporting victim-survivors and improving interventions for perpetrators are both needed. However, intervening once violence has occurred is arguably too late.

We need to direct our efforts towards broader, holistic approaches to prevent and reduce intimate partner violence, including addressing the underlying contributors to violence we’ve outlined.

We also need to look more widely at preventing intimate partner violence and gendered violence.

We need developmentally appropriate education and skills-based programs for adolescents to prevent the emergence of unhealthy relationship patterns before they become established.

We also need to address the social determinants of health that contribute to violence. This includes improving access to affordable housing, employment opportunities and accessible health-care support and treatment options.

All these will be critical if we are to break the cycle of intimate partner violence and improve outcomes for victim-survivors.

The National Sexual Assault, Family and Domestic Violence Counselling Line – 1800 RESPECT (1800 737 732) – is available 24 hours a day, seven days a week for any Australian who has experienced, or is at risk of, family and domestic violence and/or sexual assault.

If this article has raised issues for you, or if you’re concerned about someone you know, call Lifeline on 13 11 14. In an emergency, call 000.

Siobhan O’Dean, Postdoctoral Research Associate, The Matilda Centre for Research in Mental Health and Substance Use, University of Sydney; Lucinda Grummitt, Postdoctoral Research Fellow, The Matilda Centre for Research in Mental Health and Substance Use, University of Sydney, and Steph Kershaw, Research Fellow, The Matilda Centre for Research in Mental Health and Substance Use, University of Sydney

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