Global flu activity rises

A recent World Health Organization global influenza update indicates that flu activity is low in most nations, but parts of Southeast Asia and Latin America are seeing active transmission.

Cuba and El Salvador are currently seeing increasing circulation of influenza A (H3N2), a strain that reached peak levels in Honduras in August, according to

Although most of South America is reporting little transmission, Bolivia cited an increase in 2009 H1N1 activity, following a wave of increased influenza A transmission. South America’s temperate regions are reporting general decreases in flu activity and are returning to their baseline levels.

In Africa, Cameroon continues to show increased flu activity, mostly influenza B, although isolates of 2009 H1N1 have also increased in recent weeks.

Several Southeast Asian nations are seeing increased flu transmission. Thailand and Singapore are both reporting moderate activity of the H3N2 strain. Laos reported a substantial increase in H3N2 activity starting in early September. Cambodia and Vietnam are currently reporting sustained transmission of the 2009 H1N1 virus.

Australian flu activity is generally down since peaking in August. It has decreased in all states except the Northern Territory. Most of the activity is from the 2009 H1N1 strain with some circulation of influenza B.

The U.S. Centers for Disease Control and Prevention said that flu activity in the United States is below baseline, but that respiratory samples show that influenza B and H3N2 strains are currently in circulation.