The 288 new cases of pregnant women in the United States with laboratory evidence of Zika infection reported for the week ending Oct. 27, 2016, represent the largest weekly increase so far this year, according to new data from the Centers for Disease Control and Prevention.
The 52 new cases in the 50 states and the District of Columbia and the 236 cases in the U.S. territories bring the totals for the year to 1,005 and 2,263, respectively, and to 3,268 for the United States as a whole, the CDC reported.
The week ending Oct. 27 also brought reports of two more infants born with Zika-related birth defects in the 50 states/D.C., but there were no reports of Zika-related pregnancy losses. So far in 2016, there have been 25 liveborn infants with Zika-related birth defects and five pregnancy losses in the states.
The CDC is no longer reporting adverse pregnancy outcomes for the territories because Puerto Rico is not using the same “inclusion criteria to monitor brain abnormalities and other adverse pregnancy outcomes.” As of Sept. 29 – the date of the last territorial report – there had been one liveborn infant and one pregnancy loss related to Zika.
Zika-related birth defects reported by the CDC could include microcephaly, calcium deposits in the brain indicating possible brain damage, excess fluid in the brain cavities and surrounding the brain, absent or poorly formed brain structures, abnormal eye development, or other problems resulting from brain damage that affect nerves, muscles, and bones. The pregnancy losses encompass any miscarriage, stillbirth, and termination with evidence of birth defects.
The pregnancy-related figures for states, territories, and D.C. reflect reporting to the U.S. Zika Pregnancy Registry; data for Puerto Rico are reported to the U.S. Zika Active Pregnancy Surveillance System.