Just reading posts from March.
Could be, I just thought Zika --> Microwhatever. Perhaps not 1:1, but higher than 1:100. Maybe I'm wrong.
How might Zika cause brain damage in infants?
Experts aren’t yet certain.
The possibility that the Zika virus causes microcephaly – unusually small heads and often damaged brains – emerged in October when doctors in northern Brazil noticed a surge in babies with the condition.
Several reports now have shown that the virus can cross the placenta and attack fetal nerve cells, including some that develop into the brain.
Studies to prove whether the virus was to blame for microcephaly are expected to take until June, but evidence continues to mount. The virus is now considered “guilty until proven innocent,” one World Health Organization official said.
Normally, microcephaly occurs in about 1 in 5,000 to 1 in 10,000 of all births. Scientists analyzing outbreaks of the Zika virus in French Polynesia and northeast Brazil have estimated that the incidence rose to nearly 1 in 100 births nine months after those outbreaks peaked.
The way I read it is that overall microcephaly cases increased to 1 in 100 births after the zika outbreak, but the rate amongst babies born to people actually infected with zika was much higher.