About These Numbers

What these updated numbers show

• These updated numbers reflect counts of pregnant women in the United States with any laboratory evidence of possible Zika virus infection, with or without symptoms. Pregnant women with laboratory evidence include those in whom viral particles have been detected and those with evidence of an immune reaction to a recent virus that is likely to be Zika.
• This information will help healthcare providers as they counsel pregnant women affected by Zika and is essential for planning at the federal, state, and local levels for clinical, public health, and other services needed to support pregnant women and families affected by Zika.

What these new numbers do not show

• These new numbers are not comparable to the previous reports. These updated numbers reflect a different, broader population of pregnant women.
• These updated numbers are not real time estimates. They will reflect the number of pregnant women reported with any laboratory evidence of possible Zika virus infection as of 12 noon every Thursday the week prior; numbers will be delayed one week.

Where do these numbers come from?

These data reflect pregnant women in the US Zika Pregnancy Registry and the Zika Active Pregnancy Surveillance System in Puerto Rico. CDC, in collaboration with state, local, tribal and territorial health departments, established these registries for comprehensive monitoring of pregnancy and infant outcomes following Zika virus infection.

The data collected through these registries will be used to update recommendations for clinical care, to plan for services and support for pregnant women and families affected by Zika virus, and to improve prevention of Zika virus infection during pregnancy.

What are the outcomes for these pregnancies?

Visit CDC’s webpage for updated counts of poor pregnancy outcomes related to Zika. Most of the pregnancies monitored by these systems are ongoing. CDC will not report outcomes until pregnancies are complete.

Pregnancy Outcomes in the United States Territories

What these numbers show

• These numbers reflect poor outcomes among pregnancies with laboratory evidence of possible Zika virus infection reported to the US Zika Pregnancy Registry.
• The number of live-born infants and pregnancy losses with birth defects are combined for the 50 US states, the District of Columbia, and the US territories. To protect the privacy of the women and children affected by Zika, CDC is not reporting individual state, tribal, territorial or jurisdictional level data.
• The poor birth outcomes reported include those that have been detected in infants infected with Zika before or during birth, including 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 damage to brain that affects nerves, muscles and bones, such as clubfoot or inflexible joints.

What these new numbers do not show

• These numbers are not real time estimates. They will reflect the outcomes of pregnancies reported with any laboratory evidence of possible Zika virus infection as of 12 noon every Thursday the week prior; numbers will be delayed one week.
• These numbers do not reflect outcomes among ongoing pregnancies.
• Although these outcomes occurred in pregnancies with laboratory evidence of Zika virus infection, we do not know whether they were caused by Zika virus infection or other factors.

Where do these numbers come from?

• These data reflect pregnancies reported to the US Zika Pregnancy Registry. CDC, in collaboration with state, local, tribal and territorial health departments, established this registry for comprehensive monitoring of pregnancy and infant outcomes following Zika virus infection.
• The data collected through this system will be used to update recommendations for clinical care, to plan for services and support for pregnant women and families affected by Zika virus, and to improve prevention of Zika virus infection during pregnancy.

These registries are covered by an assurance of confidentiality. This protection requires us to safeguard the information collected for the pregnant women and infants in the registries.

* Includes 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 damage to the brain that affects nerves, muscles and bones, such as clubfoot or inflexible joints.

**Includes miscarriage, stillbirths, and terminations with evidence of the birth defects mentioned above