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Avian influenza A/H5N1 in cats. Prof. Pyrć: worried that there are numerous infections among animals that accompany humans
EWA KURZYŃSKA SPOKE published: today, 01-07-2023, 11:36
A/H5N1 in cats in Poland: "We have made the first sequence of the virus public and we are currently making efforts to characterize it as soon as possible" - says in an interview for "Puls Medycyny" prof. Krzysztof Pyrć, virologist, leader of the Virology Laboratory at the Małopolska Center of Biotechnology of the Jagiellonian University.
Will A/H5N1, isolated from cats in Poland, be sequenced and checked for possible mutations and their significance for the potential transmission or virulence of the virus?
We have already made the first sequence of the virus public and we are currently making efforts to characterize it as soon as possible. We work together with colleagues from Gdańsk - dr. hab. Maciej Grzybek and Dr. Łukasz Rąbalski. This significantly increases efficiency, especially since our experiences are complementary.
Since when is avian influenza A/H5N1 a threat?
It's been over 23 years, because this virus was identified at the turn of the 20th and 21st centuries. Even then we realized that influenza A/H5N1 could be a problem. Until recently, it was seen as a potential danger that was worrying, but after so long, it was no longer of concern. Why? The range of occurrence of influenza A/H5N1 has long been limited: it appeared either in very small outbreaks or isolated cases. In the fall of 2021, however, something changed. The virus began to spread much better between birds, which resulted in the spread of influenza A/H5N1 worldwide. As a result, we have been dealing with a pandemic among birds for almost 2 years. Information about this reached a wider audience through images of dead wild birds and stories about the liquidation of infected poultry farms.
The good news is that influenza A/H5N1 has poor transmission between mammals, and the bad news is that it causes deadly disease in many species. There are constantly reports that there are infections among wild animals in Europe, e.g. foxes. In March this year, it was reported that sea lions in South America were dying en masse due to A/H5N1. Thousands of deaths have been recorded among these animals. These wild animal infections have been worrying, but another factor has emerged - mammal-to-mammal transmission is on the rise. In the fall of 2022, mink infections were reported in Spain, where infection of the herd and transmission between them took place. This may mean that the virus has started to evolve and is gaining the ability to be more transmissible between mammals.
So this virus is becoming more transmissible?
Not yet, but there are signs that this may happen. Nobody wants a "repeat of entertainment" from the last three years, when a new, dangerous respiratory virus appeared and paralyzed reality. However, I have the impression that we are all so tired of the topic of COVID that we are reluctant to hear about another potential threat.
What is happening now in cats is a consequence of the events of the last 20 years. It is worrying that for the first time there are numerous infections among animals that accompany humans. Because while we do not hug sea lions, we do not have close contact with them, in the case of cats this close contact is guaranteed. At the same time, I want to make it clear that the risk is not high, but also not zero; it's worth keeping common sense.
How can cats get avian flu?
This is currently the most important task for veterinary services to determine the transmission routes of the virus. It needs to be identified for several reasons. Firstly, to minimize the number of sick cats and limit the evolution of the virus, but also to check that humans cannot fall victim to the same source.
There are several possibilities. Or cats get infected directly from birds, which is relatively unlikely, considering that cats who did not leave the house at all were also affected. The A/H5N1 virus can be transmitted through contact, i.e. in the mud that we bring into the house, there can be feces of sick animals. Then the fecal-oral route of infection is possible. A third possibility is that the source of the virus was food, possibly contaminated feed, such as meat.
Heat treatment of meat or eggs effectively kills the virus we are talking about?
Yes. This is a virus that is relatively sensitive to external factors, just like the coronavirus. It is an RNA virus, i.e. its genetic material is in the form of less stable nucleic acid. In addition, it is an enveloped virus, which means that it is covered with a protein-lipid membrane that is sensitive to detergents, but also to chemical and physical factors. All this makes influenza viruses easy to neutralize with simple methods. In the case of meat, heat treatment is effective. I would like to make it clear here that we should behave adequately to the situation and not fall into paranoia. Let's wash our hands if the pet is sick or we are dealing with raw meat, but let's not spill hectoliters of disinfectants on ourselves.
Do we have the tools to fight the A/H5N1 virus should it appear in humans?
Here, the situation is favorable because in the case of influenza virus, diagnostic tests are available, even quick ones. Second, there is a targeted vaccine that should theoretically work. Third, there are antivirals that should work. Why am I repeating the word "should" several times? Because the flu virus changes very quickly. And if someone thinks that SARS-CoV-2 mutated quickly, that it was impossible to keep up with it, the flu virus in this competition wins with it in the pre-runs. The rate of evolution of the influenza virus is much faster. We see this very clearly every year when attention is drawn to use the vaccine for the season, because last year's vaccine may not be effective. It can be assumed that the vaccine that was developed against influenza A/H5N1 many years ago may be ineffective. Second, we don't have enough that everyone should be vaccinated immediately if necessary. New preparations will not be manufactured and delivered overnight. The technology and concept of a vaccine against influenza, including avian influenza, is ready. However, it is necessary to start production and test whether the vaccine works. It needs time. As for diagnostic tests, the principle is the same. Yes, we have them, but you need to verify whether they are effective in a given season, with certain types of virus. The variability of nature is so great that they can lose sensitivity or selectivity. As for diagnostic tests, the principle is the same. Yes, we have them, but you need to verify whether they are effective in a given season, with certain types of virus. The variability of nature is so great that they can lose sensitivity or selectivity. As for diagnostic tests, the principle is the same. Yes, we have them, but you need to verify whether they are effective in a given season, with certain types of virus. The variability of nature is so great that they can lose sensitivity or selectivity.
When it comes to drugs, the situation is again similar. In general, influenza A/H5N1 viruses are susceptible to treatment with oseltamivir, but we cannot assume that future strains will be 100 percent. susceptible and drug-resistant strains will not emerge. At this point, I want to emphasize that drugs that are harmless in humans can kill an animal. And as far as I know, anti-flu drugs have not been tested in cats, they are not registered and should not be given to these animals without consulting a veterinarian.
What is the course of bird flu in humans?
The original bird flu virus, which has been around for more than 20 years, causes human disease with a mortality rate of 60%. But this virus has changed, it has started to transmit better among birds. If it comes to a situation where it gains the ability to move between people, it has to change again. Probably, as was the case with the omicron, the A/H5N1 virus would then have to gain the ability to multiply better in the upper parts of the respiratory tract, which will most likely lead to a worse performance in the lower respiratory tract, i.e. the lungs. And let's hope this death rate continues to decline. However, it must also be assumed that even if A/H5N1 gets better, it will still cause a very dangerous, severe disease.
Can this virus cause a pandemic among humans?
If we have a virus pandemic among animals that can be transmitted to humans, then unfortunately it has the potential to cause a pandemic among humans as well. The only question is when and how seriously it threatens us.
...
https://pulsmedycyny.pl/ptasia-gryp...zwierzat-ktore-towarzysza-czlowiekowi-1189517
Avian influenza A/H5N1 in cats. Prof. Pyrć: worried that there are numerous infections among animals that accompany humans
EWA KURZYŃSKA SPOKE published: today, 01-07-2023, 11:36
A/H5N1 in cats in Poland: "We have made the first sequence of the virus public and we are currently making efforts to characterize it as soon as possible" - says in an interview for "Puls Medycyny" prof. Krzysztof Pyrć, virologist, leader of the Virology Laboratory at the Małopolska Center of Biotechnology of the Jagiellonian University.
Will A/H5N1, isolated from cats in Poland, be sequenced and checked for possible mutations and their significance for the potential transmission or virulence of the virus?
We have already made the first sequence of the virus public and we are currently making efforts to characterize it as soon as possible. We work together with colleagues from Gdańsk - dr. hab. Maciej Grzybek and Dr. Łukasz Rąbalski. This significantly increases efficiency, especially since our experiences are complementary.
Since when is avian influenza A/H5N1 a threat?
It's been over 23 years, because this virus was identified at the turn of the 20th and 21st centuries. Even then we realized that influenza A/H5N1 could be a problem. Until recently, it was seen as a potential danger that was worrying, but after so long, it was no longer of concern. Why? The range of occurrence of influenza A/H5N1 has long been limited: it appeared either in very small outbreaks or isolated cases. In the fall of 2021, however, something changed. The virus began to spread much better between birds, which resulted in the spread of influenza A/H5N1 worldwide. As a result, we have been dealing with a pandemic among birds for almost 2 years. Information about this reached a wider audience through images of dead wild birds and stories about the liquidation of infected poultry farms.
The good news is that influenza A/H5N1 has poor transmission between mammals, and the bad news is that it causes deadly disease in many species. There are constantly reports that there are infections among wild animals in Europe, e.g. foxes. In March this year, it was reported that sea lions in South America were dying en masse due to A/H5N1. Thousands of deaths have been recorded among these animals. These wild animal infections have been worrying, but another factor has emerged - mammal-to-mammal transmission is on the rise. In the fall of 2022, mink infections were reported in Spain, where infection of the herd and transmission between them took place. This may mean that the virus has started to evolve and is gaining the ability to be more transmissible between mammals.
So this virus is becoming more transmissible?
Not yet, but there are signs that this may happen. Nobody wants a "repeat of entertainment" from the last three years, when a new, dangerous respiratory virus appeared and paralyzed reality. However, I have the impression that we are all so tired of the topic of COVID that we are reluctant to hear about another potential threat.
What is happening now in cats is a consequence of the events of the last 20 years. It is worrying that for the first time there are numerous infections among animals that accompany humans. Because while we do not hug sea lions, we do not have close contact with them, in the case of cats this close contact is guaranteed. At the same time, I want to make it clear that the risk is not high, but also not zero; it's worth keeping common sense.
How can cats get avian flu?
This is currently the most important task for veterinary services to determine the transmission routes of the virus. It needs to be identified for several reasons. Firstly, to minimize the number of sick cats and limit the evolution of the virus, but also to check that humans cannot fall victim to the same source.
There are several possibilities. Or cats get infected directly from birds, which is relatively unlikely, considering that cats who did not leave the house at all were also affected. The A/H5N1 virus can be transmitted through contact, i.e. in the mud that we bring into the house, there can be feces of sick animals. Then the fecal-oral route of infection is possible. A third possibility is that the source of the virus was food, possibly contaminated feed, such as meat.
Heat treatment of meat or eggs effectively kills the virus we are talking about?
Yes. This is a virus that is relatively sensitive to external factors, just like the coronavirus. It is an RNA virus, i.e. its genetic material is in the form of less stable nucleic acid. In addition, it is an enveloped virus, which means that it is covered with a protein-lipid membrane that is sensitive to detergents, but also to chemical and physical factors. All this makes influenza viruses easy to neutralize with simple methods. In the case of meat, heat treatment is effective. I would like to make it clear here that we should behave adequately to the situation and not fall into paranoia. Let's wash our hands if the pet is sick or we are dealing with raw meat, but let's not spill hectoliters of disinfectants on ourselves.
Do we have the tools to fight the A/H5N1 virus should it appear in humans?
Here, the situation is favorable because in the case of influenza virus, diagnostic tests are available, even quick ones. Second, there is a targeted vaccine that should theoretically work. Third, there are antivirals that should work. Why am I repeating the word "should" several times? Because the flu virus changes very quickly. And if someone thinks that SARS-CoV-2 mutated quickly, that it was impossible to keep up with it, the flu virus in this competition wins with it in the pre-runs. The rate of evolution of the influenza virus is much faster. We see this very clearly every year when attention is drawn to use the vaccine for the season, because last year's vaccine may not be effective. It can be assumed that the vaccine that was developed against influenza A/H5N1 many years ago may be ineffective. Second, we don't have enough that everyone should be vaccinated immediately if necessary. New preparations will not be manufactured and delivered overnight. The technology and concept of a vaccine against influenza, including avian influenza, is ready. However, it is necessary to start production and test whether the vaccine works. It needs time. As for diagnostic tests, the principle is the same. Yes, we have them, but you need to verify whether they are effective in a given season, with certain types of virus. The variability of nature is so great that they can lose sensitivity or selectivity. As for diagnostic tests, the principle is the same. Yes, we have them, but you need to verify whether they are effective in a given season, with certain types of virus. The variability of nature is so great that they can lose sensitivity or selectivity. As for diagnostic tests, the principle is the same. Yes, we have them, but you need to verify whether they are effective in a given season, with certain types of virus. The variability of nature is so great that they can lose sensitivity or selectivity.
When it comes to drugs, the situation is again similar. In general, influenza A/H5N1 viruses are susceptible to treatment with oseltamivir, but we cannot assume that future strains will be 100 percent. susceptible and drug-resistant strains will not emerge. At this point, I want to emphasize that drugs that are harmless in humans can kill an animal. And as far as I know, anti-flu drugs have not been tested in cats, they are not registered and should not be given to these animals without consulting a veterinarian.
What is the course of bird flu in humans?
The original bird flu virus, which has been around for more than 20 years, causes human disease with a mortality rate of 60%. But this virus has changed, it has started to transmit better among birds. If it comes to a situation where it gains the ability to move between people, it has to change again. Probably, as was the case with the omicron, the A/H5N1 virus would then have to gain the ability to multiply better in the upper parts of the respiratory tract, which will most likely lead to a worse performance in the lower respiratory tract, i.e. the lungs. And let's hope this death rate continues to decline. However, it must also be assumed that even if A/H5N1 gets better, it will still cause a very dangerous, severe disease.
Can this virus cause a pandemic among humans?
If we have a virus pandemic among animals that can be transmitted to humans, then unfortunately it has the potential to cause a pandemic among humans as well. The only question is when and how seriously it threatens us.
...
https://pulsmedycyny.pl/ptasia-gryp...zwierzat-ktore-towarzysza-czlowiekowi-1189517