In 2024, a significant effort took place to better understand how avian coronavirus, or bird flu, spreads among poultry in China. This involved collecting samples from various locations across the country. Over 7, 600 samples were gathered from 153 different sites spread across 13 provinces. The results showed that about 20. 60 percent of these samples tested positive for the virus. This means nearly one in five birds tested carried the virus.

The most common bird to test positive was the chicken. Pigeons were the next most affected, followed by ducks and geese. The virus was found in 56. 21 percent of the sampling sites, showing just how widespread it is. The rates of infection varied greatly, from as low as 2. 91 percent to as high as 32. 27 percent. This variation suggests that some areas are much more affected than others.

One surprising finding was the high rate of infection in markets. Retail markets had a 98. 08 percent positivity rate, while wholesale markets had a 100 percent rate. This is much higher than the rates found in slaughterhouses and poultry farms, which were 80. 00 percent and 20. 25 percent, respectively. This data raises questions about how the virus is spreading and how it might be controlled.

To get a deeper understanding, 231 different strains of the virus were selected for genetic analysis. This analysis showed that there are ten different genotypes of the virus circulating in China. Some of these genotypes are more common than others. The most prevalent strains were GI-19 and GVI-1, making up about 35. 06 percent and 33. 77 percent of the samples, respectively. This genetic diversity is important to note, as it can affect how the virus behaves and how it might be treated.

One reassuring finding was that no cases of SARS-CoV-2, the virus that causes COVID-19 in humans, were found in the poultry samples. This is important because it shows that the bird flu virus found in these samples is not the same as the virus that causes COVID-19. This distinction is crucial for public health, as it means that the bird flu virus does not pose the same risk to humans as SARS-CoV-2.

This study provides valuable insights into the spread and genetic makeup of avian coronavirus in China. By understanding where the virus is most prevalent and how it varies genetically, researchers can develop better strategies for controlling its spread. This knowledge is essential for protecting both poultry and public health.

Bird Flu Virus: A 2024 Look at China's Poultry Farms and Markets

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