Researchers have reported the first case of human-to-human transmission of the new strain of bird flu that has emerged in China.
The British Medical Journal said a 32-year-old woman was infected after caring for her father. Both later died. Until now there had been no evidence of anyone catching the H7N9 virus other than after direct contact with birds. But experts stressed it does not mean the virus has developed the ability to spread easily between humans.
By 30 June there had been 133 cases of H7N9 bird flu reported in eastern China and 43 deaths.
Most people had visited live poultry markets or had close contact with live poultry in the week or two before they became ill.
Intensive care
Yet researchers found that the 32-year-old woman had become
infected in March after caring for her 60-year-old father in hospital. Unlike her father - who had visited a poultry market in the
week before falling ill - she had no known exposure to live poultry but
fell ill six days after her last contact with him.
Both died in intensive care of multiple organ failure.
Tests on the virus taken from both patients showed the
strains were almost genetically identical, which supports the theory
that the daughter was infected directly from her father rather than
another source.
Public health officials tested 43 close contacts of the
patients but all tested negative for H7N9, suggesting the ability of the
virus to spread was limited.
The researchers said that while there was no evidence to
suggest the virus had gained the ability to spread from person to person
efficiently, this was the first case of a "probable transmission" from
human to human.
Strong warning sign
"Our findings reinforce that the novel virus possesses the potential for pandemic spread," they concluded. Dr James Rudge, of the London School of Hygiene and Tropical
Medicine, said that limited transmission between humans is not
surprising and has been seen before in other bird flu viruses, such as
H5N1. He added: "It would be a worry if we start to see longer
chains of transmission between people, when one person infects someone
else, who in turn infects more people, and so on. "And particularly if each infected case goes on to infect, on
average, more than one other person, this would be a strong warning
sign that we might be in the early stages of an epidemic".
An accompanying editorial in the BMJ, co-authored by Dr
Rudge, concluded that while this study might not suggest that H7N9 is
any closer to delivering the next pandemic, "it does provide a timely
reminder of the need to remain extremely vigilant".
Sourced from www.bbc.com
