CDC guidance for travel and testing of pregnant women and women of reproductive age for Zika virus infection related to the investigation for local mosquito-borne Zika virus transmission in Brownsville, Cameron County, Texas
Published Date:December 14, 2016
Source:HAN ; 399
Corporate Authors:Centers for Disease Control and Prevention (U.S.)
Series:HAN ; 399
Description:December 14, 2016, 16:15 ET (4:15 PM ET)
On November 28, 2016, the Texas Department of State Health Services (TDSHS) reported the first case of locally
acquired mosquito-borne Zika virus infection in the city of Brownsville, Cameron County, Texas. On December 9,
2016, four additional cases in people living in proximity to the first case were reported. TDSHS continues to
investigate Zika virus transmission in Brownsville.
Currently only five cases are known to have been locally acquired in the Brownsville area, and there is not yet any
evidence of widespread, sustained local transmission. However, temperatures in the region are still conducive to
mosquito-borne transmission, and therefore the risk of continued local transmission of Zika virus cannot be ruled
out. CDC, TDSHS, and local authorities continue to investigate the cases in Brownsville and will share up-to-date
information and recommendations as the situation develops. The active, ongoing surveillance and response
underway in Texas will provide more information over time that may allow for more precise and focused
assessment of risk. The exact level and location of risk of Zika virus infection in Brownsville is unknown; pregnant
women in the area are at some risk for Zika virus infection.
For these reasons, CDC is designating the city of Brownsville as a Zika cautionary (yellow) area for testing and
travel guidance, as recommended in the CDC Interim Zika Response Plan (https://www.cdc.gov/zika/pdfs/zikadraft-
interim-conus-plan.pdf ). Based on the earliest time of symptom onset for cases of locally acquired Zika virus
infection in Brownsville and a maximum 2-week incubation period for Zika virus, this guidance applies to pregnant
women, women of reproductive age, and their sexual partners who live in or traveled to Brownsville on or after
October 29, 2016. Because many people with Zika virus infection will not have symptoms or will have only mild
symptoms, additional people may be infected.
Brownsville is located in Cameron County, Texas, which shares a border with Mexico
(https://www.cdc.gov/zika/intheus/texas-update.html). Many people travel regularly across the United States-
Mexico border to temporarily live, work, attend school, socialize, and seek medical care. Areas of active Zika virus
transmission have also been reported in Mexico near the United States-Mexico border, and CDC issued a Travel
Notice for Mexico (https://wwwnc.cdc.gov/travel/notices/alert/zika-virus-mexico) on December 10, 2015,
recommending that pregnant women should not travel to any area of Mexico below 6,500 feet.
This is an ongoing investigation, and TDSHS, Cameron County Health Department, Brownsville Health
Department, and CDC are working together to rapidly learn more about the extent of Zika virus transmission in
Brownsville. CDC will update these recommendations as more information becomes available.
CDC HAN 399 CDC Guidance for Travel and Zika Testing Brownsville Cameron Co Texas 12 14 2016.pdf
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