H7N9. The incidence of human infections with the H7N9 avian influenza virus in China has declined since May 2013 owing to a number of interventions; however, so far in 2014, ∼100 infections and at least 19 deaths have been reported. The resurgence of the virus has been attributed to increased virus circulation during the winter months and to the rise in travel and live poultry trading ahead of the Chinese New Year. The Guardian/BBC News/WHO

Chikungunya virus. The mosquito-borne chikungunya virus is spreading rapidly in the Caribbean, which is the first time indigenous transmission of the virus has been documented in the Americas. Thus far, >780 confirmed and/or probable cases have been reported, and public health officials are urging for vector control strategies to be implemented to curb the outbreak. PAHO/WHO/ECDC