Fortunately, the H5N1 virus transmitted to humans in 1997 did not develop the capacity for human-to-human transmission. The outbreak was contained and the source of infection was eliminated by the decisive slaughter of more than 1.5 million birds in the Hong Kong poultry markets.
Was there a pandemic in 1997?
The 1997 Hong Kong outbreak of an avian influenzalike virus, with 18 proven human cases, many severe or fatal, highlighted the challenges of novel influenza viruses.
What was 1997 flu?
In 1997, a high-pathogenicity H5N1 avian influenza virus caused serious disease in both man and poultry in Hong Kong, China. Eighteen human cases of disease were recorded, six of which were fatal. This unique virus was eliminated through total depopulation of all poultry markets and chicken farms in December 1997.
How does H5N1 virus affect human?
Asian HPAI H5N1 viruses have infected the respiratory tract of humans, causing severe illness (e.g. pneumonia and respiratory failure) and death in some people. The majority of human infections with Asian HPAI H5N1 have occurred among children and adults younger than 40 years old.
When was the last bird flu outbreak?
United States 2014-2015 Outbreak In total, the 2014-2015 H5N2/H5N8 outbreak cost US$879 million in public expenditures to eradicate the disease from poultry production; the most costly United States HPAI outbreak to date.
How did bird flu start?
The outbreak was linked to handling infected poultry. H5N1 occurs naturally in wild waterfowl, but it can spread easily to domestic poultry. The disease is transmitted to humans through contact with infected bird feces, nasal secretions, or secretions from the mouth or eyes.
How many people died from the flu in 2020?
Conclusion. During the 2019-2020 influenza season, CDC estimates that influenza was associated with 38 million illnesses, 18 million medical visits, 405,000 hospitalizations, and 22,000 deaths.
How many died of the flu in 1997?
| Influenza season (Northern Hemisphere) a | U.S. excess deaths (wk)b | Influenza season (Southern Hemisphere) d |
|---|---|---|
| 1993-94 | 9,800 (11) | 1994 |
| 1994-95 | 5,300 (15) | 1995 |
| 1995-96 | 6,300 (16) | 1996 |
| 1996-97 | 11,400 (18) | 1997 |
Was there a virus in 1996?
From October 1995 through August 1996, influenza activity occurred at moderate to severe levels worldwide. Epidemic activity in Europe, Asia, and North America was associated with influenza A(H1N1) and influenza A(H3N2) viruses.
How many have died from H5N1?
To date, the number of H5N1 WHO-confirmed human cases amounts to 628 with 374 deaths from 15 countries. Human infections tend to occur during December–March and are associated with bird migratory paths and seasonal outbreaks in poultry.
When was the first outbreak of H5N1 in humans?
The first outbreak of avian influenza A(H5N1) virus in humans occurred in Hong Kong in 1997. Infection was confirmed in 18 individuals, 6 of whom died. Infections were acquired by humans directly from chickens, without the involvement of an intermediate host. The outbreak was halted by a territory-w …
How did the spread of H5N1 affect the world?
Main article: Global spread of H5N1 in 2005 In January 2005 an outbreak of avian influenza affected thirty three out of sixty four cities and provinces in Vietnam, leading to the forced killing of nearly 1.2 million poultry. Up to 140 million birds are believed to have died or been killed because of the outbreak.
How is H5N1 transmitted from bird to human?
HPAI A(H5N1) is considered an avian disease, although there is some evidence of limited human-to-human transmission of the virus. A risk factor for contracting the virus is handling of infected poultry, but transmission of the virus from infected birds to humans has been characterized as inefficient.
How many birds were killed by H5N1 in Vietnam?
In January 2005 an outbreak of avian influenza affected thirty three out of sixty four cities and provinces in Vietnam, leading to the forced killing of nearly 1.2 million poultry. Up to 140 million birds are believed to have died or been killed because of the outbreak.
