Iran has managed to control avian flu in seven provinces, said Head of Veterinary Organization (IVO) Mehdi Khalaj.
"Iran has controlled avian flu in 7 provinces,” he said, adding cold and reduce temperature triggers virus outbreak in affected areas.
Iran has so far destroyed 5 million chickens with avian flu in industrial aviculture, Khalaj said.
8 Affected areas include wetlands and lakes in Ardabil, Gilan, Qom, Mazandaran, Qazvin and Markazi provinces.
Most part of Asia and Middle East have been affected so far, he said.
Khalaj continued that so far South Korea has destroyed 20 million birds with avian flu.
On Tuesday, the World Health Organization (WHO) issued a new directive on the deadly avian virus, inviting countries around the world to monitor its outbreak and potential threats to human beings.
"The rapidly expanding geographical distribution of these outbreaks and the number of virus strains currently co-circulating have put WHO on high alert," WHO Director-General Margaret Chan said in Geneva.
Over the past few months, the highly contagious H5N8 virus has been reported in at least 40 countries. Scientists have raised concerns that bird flu strains could mutate to be transmitted in humans.
Chan also mentioned that following the rather "mild” pandemic of the H1N1 virus in 2009-2010, more preparation is underway globally for the next influenza pandemic.
According to WHO, 350 million doses of vaccine have been promised for distribution under a certain agreement with drug makers. In return, countries must share their virus
samples in a move towards deriving a pandemic vaccine.
With regards to China, Chan said it was not possible to rule out the possibility of human-to-human infection in two of the reported cases, but pointed out that these examples were not accounted as grim strains of the virus.
Based on the International Health Regulations, the 194 WHO member states are mandated to fulfill their duty by detecting and reporting cases early so that human cases can be identified.
According to official reports from China’s delegation led by Zhang Yang, the country has already recorded as many as 225 cases in the fifth wave of the H7N9 activity.
The first case of a human contracting avian influenza virus of the H7N9 strain was registered in China in March 2013. A number of deaths have been reported in 2106 amid an outbreak of the H7N9 virus in birds there.
France, with the largest poultry flock in the European Union, has reported outbreaks of the H5N8 virus. A massive poultry culling was performed in the EU in 2014 due to the virus.
The H5N8 virus is highly contagious in birds but it has never been found in humans.
Earlier in January, the US Department of Agriculture reported that a type of bird flu in a wild duck was detected in Montana. The flu appeared to match one of the strains found during an outbreak of the disease in 2014 and 2015 that led to the deaths of millions of chickens.