Wild birds in Denmark and Switzerland test positive for H5N8, while H5N1 hits Nigeria and H5N6 strikes South Korea.
In the past few weeks, 8 European nations, plus India and Israel, have confirmed H5N8, mainly in migratory waterfowl.
The strain has also been detected farther west in Europe in wild birds in Switzerland, as well as in Germany.
China is reporting two new H7N9 avian influenza infections, the first since July. The new cases potentially mark the start of the fifth wave of infections.
The virus is spreading south and west as experts predicted after the H5 clade was discovered in Russia in June.
Austrian officials said H5N8 had also been found in Croatia, which would raise the number of countries affected in Europe to five.
The Food and Agriculture Organization of the United Nations (FAO) issued a report on the smattering of H5N8 highly pathogenic avian influenza (HPAI) cases in Hungary and India reported last week. They said the cases are likely from the Tyva 2016 strain first reported in Russia in September, and predicted the strain will pose a risk to Europe and the Middle East through March of 2017.
Hungary and India reported H5N8, and Algeria found an H7N1 link to a waterfowl die-off.
A study published yesterday in the journal Pediatrics shows that a single inhaled dose of 20 milligrams of laninamivir octanoate reduced the relative risk of contracting influenza by 45.8% in children under the age of 10 years.
Sixteen of 18 cases of variant H3N2 influenza (H3N2v) reported in Michigan and Ohio this summer were caused by a new genotype, according to a report today in Morbidity and Mortality Weekly Report (MMWR).
