The Zika virus is transmitted by mosquito bites. Until recently, it was assumed that transmission did not occur by other means of close contact. However, a patient in Texas has spread the virus through sexual contact according to the Dallas County Health and Human Services Department. This is the first case of transmission inside the USA.
The World Health Organization (WHO) and other agencies are alarmed at how fast the virus is spreading. For example, over 4,000 cases of microcephaly have been reported since October 2015 in Brazil alone. Microcephaly is the term applied to an infant whose head is much smaller than average. This neurological condition may cause poor brain function, seizures, convulsions, spastic quadriplegia, and reduced life expectancy.