So far, the only region reporting a large number of microcephaly cases is the northeastern tip of Brazil.
Puerto Rico reported 512 confirmed Zika virus cases the week ending December 3, bringing the island total to 35,648.
Researchers report that changed weather patterns caused by the 2015 El Niño, fueled the Zika outbreak in South America.
Scientists advanced the battle against Zika in 2016 with research to understand, detect, track, and mitigate the virus.
Scientists have been trying to figure out if the Zika virus can cause serious birth defects and, if yes, how often?
Researchers examined the risk that the Zika virus will establish a sylvatic cycle in the Americas, focusing on Brazil.
The Tanzania National Institute for Medical Research has found that 15.6 percent of the 533 people whose blood samples were tested have the Zika virus.
Ho Chi Minh City has identified 133 Zika patients in 23 out of its 24 districts.
Investigators noted that some new virus mutations began appearing as the virus travelled from island to island across the Pacific, and shortly after these mutations French Polynesia recorded an increase in microcephaly and Guillain-Barré Syndrome.
Researchers used a global stochastic epidemic model to project the spread of the Zika virus in the Americas.