Bird Flu and Human Health: What You Need to Know

Bird flu, also known as avian influenza, is a type of flu that affects birds and can be transmitted to humans.

The virus that causes bird flu is highly contagious among birds, but it's rare for humans to catch it from birds.

However, bird flu can spread from person to person through close contact with an infected person.

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Bird flu, also known as avian flu and H5N1, is a type A influenza that can infect humans, birds, and other animals.

It's a more severe form of flu compared to type B, which is generally milder and only affects people.

The bird flu virus has circulated in wild and domestic birds in Asia, Africa, and Europe since 1997, when human cases were first documented in Asia.

Migratory birds are likely responsible for bringing the virus to North America, where it has now spread among birds and mammals.

The virus has caused periodic human infections in Asia, Africa, and Europe, and has even reached the United States in recent years.

In almost every case, bird flu infection leads to a distinctive symptom: bloodshot, brightly colored eyes.

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Bird flu is a respiratory virus that spreads through the air and by touching surfaces contaminated with viral droplets, similar to the common cold.

It's not bloodborne, so you can't get it through a cut or a blood transfusion.

To catch bird flu, you need to breathe in air containing viral particles or touch a surface that has them on it.

Birds and other animals shed the virus in their saliva, mucous, and feces, making them potential sources of infection.

If you're around infected birds or animals, you can get the virus in your eyes, nose, or mouth, or breathe it in.

Bird flu infections in people are rare, but they often happen after prolonged contact with infected birds or animals without proper protection.

Farmers who got infected in California were all in close contact with dairy cows, and none of them transmitted the virus to others in their household.

It's mainly contagious among poultry and dairy cows, not among people.

For your interest: World Health Organization Bird Flu

Symptoms of bird flu can be quite varied, but common ones include eye redness, cough, sore throat, runny or stuffy nose, muscle or body aches, headaches, fatigue, shortness of breath or difficulty breathing, and fever with a temperature of 100ºF (37.8ºC) or greater.

In some cases, people may not experience fever at all. Animals do not normally spread avian flu to humans, nor does it usually spread from person to person.

Here are some specific symptoms you should be aware of:

The symptoms of bird flu can be quite similar to those of the common flu.

Common symptoms include eye redness, cough, sore throat, runny or stuffy nose, muscle or body aches, headaches, fatigue, shortness of breath or difficulty breathing, and fever (temperature of 100ºF [37.8ºC] or greater) or feeling feverish.

These symptoms can also include mild flu-like upper respiratory symptoms like congestion, pneumonia, and cough.

Fever may not always be present, but it's a key indicator of the virus.

Here are some of the common symptoms of bird flu in a list:

Laboratory diagnosis of H5N1 disease is challenging due to its nonspecific nature, requiring a high index of suspicion and sensitive detection methods.

The most sensitive detection methods available include reverse transcriptase PCR (RT-PCR) and may require testing multiple specimens. Virus culture, antigen detection, and detection of rising titers of antibodies are also options for diagnosing influenza virus in clinical specimens.

Viral RNA can be detected in respiratory specimens for up to 16 days after the onset of illness, indicating that virus is shed and can be detected for prolonged periods. This means that specimens should be tested fresh upon receipt in the laboratory, and for long-term storage, they should be frozen at −70°C.

Nasopharyngeal aspirates, nasopharyngeal, throat, and nose swabs have all been used for the detection of H5N1 virus, but it remains unclear which is the diagnostic specimen of choice. Throat swabs have been shown to have higher virus loads and diagnostic yields than nose swabs.

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Endotracheal aspirates or bronchoalveolar lavages are likely to represent the optimal diagnostic specimens for the diagnosis of H5N1 disease, as viral load is higher in the lower respiratory tract. However, these specimens may not be readily available in all situations.

Antigen detection tests, such as direct immunofluorescence and enzyme immunoassay (EIA), are widely used for the diagnosis of human influenza virus, but they have low clinical sensitivity for the diagnosis of avian influenza H5N1 virus. These tests can only confirm a diagnosis of influenza A virus, requiring additional subtype-specific diagnostic methods to differentiate avian from human influenza virus.

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To prevent the spread of bird flu, it's essential to avoid contact with sick birds and other animals. If you must handle sick or dead birds or animals, wear recommended personal protective equipment, including an N95 respirator, eye protection, and gloves.

Drinking pasteurized milk is another way to protect yourself from bird flu, as pasteurization eliminates potentially harmful bacteria and viruses. Cooking poultry and meat products to an internal temperature of 165 degrees F is also crucial, and be sure to wash your hands and surfaces when handling raw meat and poultry.

Feeding raw poultry products to domestic animals, especially cats, can also increase the risk of avian flu exposure. To mitigate this risk, it's recommended to avoid feeding raw poultry products to your pets. If you do handle raw pet food or raw poultry, make sure to thoroughly wash your hands and disinfect surfaces.

Here's a summary of key prevention measures:

Researchers are actively working on developing a vaccine for the bird flu, but none are currently available to the public.

The seasonal flu vaccine can help prevent mutations that occur when someone is infected with both bird flu and another flu variety.

Antiviral medications like oseltamivir, also known as Tamiflu, can be used to treat people who have suspected or confirmed cases of bird flu infection, but they work best when started within 48 hours of showing symptoms.

People can help prevent infection by following safety measures on farms, practicing proper hand hygiene, and avoiding touching their faces after handling animals or working in their environments.

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Vaccines are being developed and researched to protect people from various diseases. For example, vaccines for the bird flu are in development but not yet available to the public.

Currently, there are no vaccines available to the public for the bird flu, but researchers are actively working on it.

The seasonal flu vaccine is not a guarantee against catching the bird flu, but getting this year's flu vaccine is still a good idea, especially for those who work with dairy cattle or poultry farms.

It's worth noting that the seasonal flu vaccine won't protect you from the bird flu.

However, experts are concerned that if you catch the common flu and the bird flu at the same time, the two viruses could combine into new variants that spread more easily through human contact.

Getting vaccinated against the common flu is still a crucial step in protecting public health, even if it doesn't directly protect against the bird flu.

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Antiviral treatment can be effective in treating people with bird flu infection, and it's best when started within 48 hours of showing symptoms.

Oseltamivir, also known by the brand name Tamiflu, is an antiviral medication that can be used to treat people with suspected or confirmed cases of bird flu infection.

The seasonal flu vaccine can still help prevent dangerous mutations that happen if someone is infected with both bird flu and another flu variety, even though it doesn't prevent H5N1 bird flu infections.

There are currently no approved treatments for animals besides vaccinations for livestock, which can provide some level of protection.

Most treatments for pets involve supportive care, such as alleviating symptoms when possible, as there are no specific antiviral treatments available for them.

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Human cases of bird flu are relatively rare, with only 10 confirmed cases reported so far.

The CDC has not reported any presumptive human cases, but new cases are added as they are reported.

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People who work with potentially infected livestock or other animals are at higher risk of infection, which is currently classified as moderate or high.

Infections can spread quickly among birds in poultry farms, putting those in close contact with the birds at increased risk.

Those responsible for culling infected flocks are also highly exposed to the virus.

Infected cows have been found to shed the virus in their milk, which can put people who handle or drink raw milk at risk.

People who work on dairy farms, handle infected cattle, or are exposed to contaminated farm environments should be cautious and watch for any bird flu symptoms.

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The current situation with bird flu and human health is a concerning one. A strain of H5N1 highly pathogenic avian influenza (HPAI) has been circulating in wild birds around the world and was first detected in the U.S. in January 2022. This avian influenza strain has also infected domestic poultry, including commercial and backyard flocks, as well as wild and domestic mammals.

There have been reported cases of human avian influenza in Washington state, with a total of 14 cases, including 11 confirmed and 3 probable cases. These cases are all linked to exposure to poultry.

The first human cases of H5 avian influenza were reported in Washington state in October 2024. To date, there is no evidence of person-to-person transmission of avian influenza in Washington state.

For the most up-to-date information on avian influenza in Washington state, visit the Washington State Department of Agriculture's Bird Flu webpage or the Washington State Department of Fish and Wildlife’s Bird Flu webpage.

Here is a summary of the human avian influenza cases in Washington state:

Public health officials work closely with local, state, and federal partners to monitor avian influenza in Washington state. They identify people exposed to infected animals to provide prevention recommendations, conduct symptom monitoring, and provide testing and treatment when indicated.

Laboratory confirmation of bird flu is challenging due to the nonspecific nature of the illness, requiring a high index of suspicion and the most sensitive detection methods available.

Laboratory procedures that involve virus culture should be carried out in BSL-3 laboratory facilities, while RT-PCR assays can be performed at BSL-2 containment with BSL-3 practices in regions where the virus is widespread.

Tests on specimens suspected to have bird flu should be done within BSL-2 containment, and serum or plasma samples are best done after heat inactivation for 30 minutes at 56°C.

Respiratory specimens are the first choice for screening purposes, as they have been shown to contain the virus for up to 16 days after the onset of illness.

Nasopharyngeal aspirates, nasopharyngeal, throat, and nose swabs have all been used for the detection of H5N1 virus, but it remains unclear which is the diagnostic specimen of choice.

Throat swabs have been found to have higher virus loads and diagnostic yields compared to nose swabs in recent outbreaks in southeast Asia.

Nasopharyngeal aspirates have been successfully used for H5N1 diagnosis, but data directly comparing diagnostic yields from NPA and pharyngeal swabs with other respiratory specimens are lacking.

Endotracheal aspirates or bronchoalveolar lavages are likely to represent the optimal diagnostic specimens for the diagnosis of H5N1 disease, as they have been found to have higher viral loads in the lower respiratory tract.

Feces and sera have also been found to contain the virus in some but not all H5N1 patients tested, but respiratory specimens remain the first choice for screening purposes.

Specimens should be transported on ice and tested fresh upon receipt in the laboratory to ensure accurate results.

For long-term storage of specimens, they should be frozen at −70°C, ideally in multiple aliquots, to preserve the virus for further testing.

Biosafety is a top priority when working with the HPAI H5N1 virus. Laboratory procedures that involve virus culture should be carried out in BSL-3 laboratory facilities.

In regions where the virus is not endemic, procedures such as RT-PCR assays that do not involve the culture of live virus may be recommended to be done under BSL-3 containment. This is because the virus is not commonly found in these areas.

However, in regions where HPAI H5N1 virus is widespread in poultry, procedures that do not involve the amplification of infectious virus by culture can be performed at BSL-2 containment with BSL-3 practices. This is a more relaxed containment level, but still requires careful handling.

Tests on serum or plasma samples are best done after heat inactivation for 30 minutes at 56°C. This helps to ensure the virus is not present.

The World Health Organization (WHO) has guidelines for the safe handling of specimens suspected to have H5N1 virus. These guidelines are available online and should be consulted if you're working with such specimens.

If you're working with respiratory specimens from suspected H5N1 patients, it's recommended to perform any tests within BSL-2 containment. This is because there's a potential presence of infectious virus in the specimens.

Here are some examples of procedures that can be performed at BSL-2 containment:

Bird flu, also known as avian influenza, is a type of viral infection that affects birds and can be transmitted to humans.

The ecology of bird flu is closely tied to the behavior and migration patterns of birds, particularly waterfowl. These birds can carry the virus without showing symptoms, making them potential carriers of the disease.

Birds can become infected with the bird flu virus through direct contact with contaminated water, soil, or other birds.

Only a few subtypes of avian influenza viruses, including H5N1, have established themselves in mammalian species like humans.

Human sera collected in southern China from the late 1970s to the early 1980s had evidence of antibodies to a number of LPAI virus subtypes, including H5, but the seroprevalence for H5 viruses was relatively low, ranging from 0% in Hong Kong to 2.3% in Jiangsu Province.

The H5 seroprevalence likely reflects exposure to low-pathogenicity H5 viruses present in ducks, not the current HPAI H5N1 virus.

Influenza viruses have strong barriers to interspecies transmission that prevent the adaptation of viruses to new hosts, which likely prevents the more frequent emergence of pandemics.

The ecology of influenza A viruses and interspecies transmission is complex, with pigs being a possible intermediate host for the generation of pandemic influenza virus through reassortment.

In the natural world, organisms have a unique set of biological properties that allow them to thrive in their environments. These properties include the ability to adapt to changing conditions, such as temperature and humidity.

Some organisms, like plants, have the ability to photosynthesize, using energy from the sun to produce their own food. This process is essential for life on Earth.

The structure of an organism's cells is also a key biological property. For example, the cell walls of plants are made up of a tough, flexible material called cellulose, which provides support and protection.

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The way an organism interacts with its environment is another important biological property. For example, some organisms, like corals, form symbiotic relationships with other organisms, such as algae, to create complex ecosystems.

The reproductive strategies of organisms also vary greatly, with some, like bacteria, able to reproduce asexually through binary fission, while others, like humans, reproduce sexually through the fusion of gametes.

To prevent the spread of bird flu, early detection is key. If an emerging pandemic is detected within the first weeks of its emergence, targeted antiviral therapy and social-distancing measures can potentially stop it.

Geographically targeted antiviral therapy, combined with social-distancing measures, can be effective in stopping a pandemic if deployed early enough. However, this strategy is challenging to implement in rural developing countries due to issues with early detection and logistics.

A vaccine, even one of moderate effectiveness, can significantly impact attack rates during a pandemic. Nonpharmaceutical interventions like hand hygiene measures may be beneficial, but the effectiveness of masks is less certain.

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Border restrictions and internal travel restrictions are unlikely to have a significant effect in mitigating the impact of an evolving pandemic. School closures may reduce peak attack rates, but may not significantly affect overall attack rates.

In densely populated cities, a combination of household-based quarantine, case isolation, and targeted use of antiviral prophylaxis can have a significant impact in reducing symptomatic attack rates, morbidity, and mortality.