Zika is a virus transmitted by the Aedes mosquito which also spreads dengue, chikungunya, and yellow fever.  Only 25% of people with Zika virus develop symptoms.  Within 2-7 days after an infected mosquito bites, the following symptoms may develop:  rash, slight fever, conjunctivitis, muscle and joint pain, and fatigue.  These symptoms can last a week.  While in the past couple of years this virus was thought to be benign, some severe, rare complications have been documented.  In Brazil there have been 4000 cases of babies born with microcephaly, a condition where the baby has a small head and incomplete brain development.  It is thought that the mothers had the virus while pregnant.  Another condition, noted in 2014, is Guillian-Barre syndrome where the immune system attacks nerve cells leading to muscle weakness and sometimes paralysis.  There is presently no vaccine or cure for the virus and over the counter pain relievers ( no aspirin or non-steroidal anti-inflammatory medications) and fluids are the recommended treatment.  The N.I.H is working on a vaccine.                                                                                    CDC added the following destinations to the Zika virus travel alerts: United States Virgin Islands and Dominican Republic. Previously, CDC issued a travel alert (Level 2-Practice Enhanced Precautions) for people traveling to regions and certain countries where Zika virus transmission is ongoing: the Commonwealth of Puerto Rico, a U.S. territory; Barbados; Bolivia; Brazil; Cape Verde; Colombia; Ecuador; El Salvador; French Guiana; Guadeloupe; Guatemala; Guyana; Haiti; Honduras; Martinique; Mexico; Panama; Paraguay; Saint Martin; Samoa; Suriname; and Venezuela.

Currently, cases of Zika in the United States are from travelers returning from countries where Zika virus has been identified.  The CDC recommends that pregnant women refrain from traveling to countries with Zika virus and that all residents take precautions to prevent mosquito bites.  http://www.cdc.gov/chikungunya/pdfs/fs_mosquito_bite_prevention_us.pdf   http://www.cdc.gov/chikungunya/pdfs/fs_mosquito_bite_prevention_travelers.pdf

Here is the 1/28/2016 CDC telebriefing:  http://www.cdc.gov/media/releases/2016/t0128-zika-virus-101.html