19 World Health Organization said that the Type A H1N1 influenza vaccine production is more difficult experts previously expected, the earliest manufacturers in mid-July to begin production of this vaccine.

WHO officials previously estimated that vaccine production will be carried out by the end of May.

Experts in accordance with the vaccine, influenza A H1N1 influenza virus in the laboratory breeding slower, with the result that researchers countries share samples of virus strains difficulties.

The experts also found that there is no evidence to suggest that seasonal influenza vaccine for the H1N1 Type A influenza work.

62nd Session of the 18th World Health Assembly opened in Geneva, Switzerland, the participants on how to deal with outbreaks of influenza H1N1 and other influenza issues.

United Nations Secretary-General Ban Ki-moon and the WHO Director-General Dr Margaret Chan, 19, and 30 met with representatives of pharmaceutical companies to discuss the H1N1 type of influenza vaccine production.