Pharmaceutical companies will be able to produce about 3 billion doses of swine flu vaccine a year ... the World Health Organization said. The U.N. agency had previously predicted that companies would be able to make up to 5 billion doses each year. The World Health Organization admits that not everyone may need vaccination. Most people will do well without the vaccine," WHO vaccine chief Marie-Paule Kieny told reporters. She said most people infected with the pandemic strain of the H1N1 virus have a mild illness and recover by themselves. Addressing concerns about the safety of the pandemic vaccine, WHO said trials to date suggest it is as safe as a regular seasonal flu shot. Kieny said large-scale vaccination programs would probably detect some cases of severe reaction following the vaccination, but that those would likely have occurred anyway without vaccination. The agency is urging countries to monitor the vaccination procedure for possible further side effects. Meanwhile WHO Director-General Dr. Margaret Chan repeated Thursday her recommendation that governments keep up their guard against swine flu but refrain from closing borders or restricting trade.