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In one group, 35% scored below average for language, 10% for cognitive development, and 16% for motor development.
Zika infection in early pregnancy raise the risk of microcephaly 17 times, the study says.
Partial protection from earlier dengue exposure in the favela population might explain Zika's quick decline there.
Dengue immunity, however, doesn't seem to generally protect against Zika infection, the researchers find.
Sexual partners of case-patients were 2.2 times more likely to contract Zika than other contacts
The data suggest that, for the vast majority of men, Zika RNA is cleared from semen within 4 months.
In another new development, the NIH today announced the start of the first human trial of a live attenuated vaccine against Zika.
Also, the CDC says to wait 3 months before trying to conceive rather than 6 after possible Zika exposure.
Zika RNA was present in semen for a median of 40 days and in vaginal fluid for a median of 14 days.
The FDA said it will continue to monitor the situation closely and that a new mosquito-borne threat would trigger individual donation testing in affected areas.
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