Blacklegged ticks become infected with Lyme disease bacteria by feeding on infected wild animals, such as deer, birds and rodents.
A team of researchers, including one of Indian orgin, has found that Zika virus can live in the eyes and have identified genetic material from the virus in tears of mice.
It is well known that the risk of stillbirth is higher in twin pregnancies, researchers said.
Scientists trying to predict the future path of Zika say that 2.6 billion people living in parts of Asia and Africa could be at risk of infection, based on a new analysis of travel, climate and mosquito patterns in those regions.
Women who breastfeed for more than six months have higher chances of surviving breast cancer, a new study has found.
In earlier cases of sexual transmission, the virus was spread by someone who at some point had symptoms.