Appearance of H7 form of bird flu in dead birds in Norfolk farm causes the killing of about 35000 chickens. There is no sign of H5N1 strain in the chickens which is more dangerous. Movements of the birds are banned now out of the boiler breeder.
Workers at the farm are providing the drug Tamiflu. Bird flu viruses are categorized in 16 ‘H’ sub-types and 9 ‘N’ sub-types. Among it H5N1, H7N3, H7N7 and H9N2 infects humans.
Other viruses than H5N1 cause trivial symptom only but H5N1 has caused more than 100 deaths in south-east Asia, China and Turkey. According to The WHO, the H5 and H7 strains can mutate easily that’s why they are always a cause for concern.
The Department for Environment, Food and Rural Affairs said, ‘despite of no exact evidence, the preventive measures are being offered to all’. Prof Hugh Pennington, a bird flu expert, said that H7 had killed one people in Holland three years ago.
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