Personally I haven't noticed any more colds among people than what's usual for the season. When the temperature drops below 15 degree celsius (55 dg fahrenheit) SE Asian people get colds and coughs.
Because it is colder than usual there might be more coughs.
Dr Hans Troedsson, the head WHO in Vietnam has issued an unusual strong warning after an outbreak of the lethal H5N1 strain was found on a poultry farm in December, the first in almost a year.
Vietnam warned on bird flu threat
New WHO chief Margaret Chan has warned that bird flu remains a global threat.
Dr Chan, a bird flu expert from Hong Kong, said reports of bird flu had started to surface in recent weeks after a lull and that the danger was particularly severe in poor countries.
"We must not let our guard down. We must maintain our vigilance," she said, after becoming the first Chinese citizen to head the UN agency.
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Dr Troedsson, the WHO's Vietnam Country Director, said last month's confirmed outbreak did not mean Vietnam's current policies had failed.
But he warned that the onset of the colder winter months - when the virus survives for longer - and February's lunar new year festivities "could have a negative impact".
"Not only the movement of people will increase but the consumption of poultry, so there will be more transport and handling and slaughtering of poultry," he told the BBC's Bill Hayton in Hanoi.
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By the way BBC has an very informative interactive map on the spread of H5N1. Can be found here.


