A Mexican woman, with a valid case of Zika virus, gave birth to a “clinically healthy” baby. The woman delivered a 2.8-kilo boy in a hospital in the city of Tuxtla Gutierrez. She belongs to the town of Pijijiapan.

After an evaluation by the hospital’s pediatric centre, the health ministry “confirmed that the infant is clinically healthy.”

She is one of the six women to have caught the Zika virus during their pregnancy, says The Journal. According to statements made by the health ministry, it has been confirmed that the other five women are in good health. They are being given continuous specialised care and are undergoing periodic ultrasound tests.

The Zika virus is distributed by mosquitoes. It has been recently linked to microcephaly, by US scientists, says Fox News. Microcephaly is a birth defect, in which the infant is born with an abnormally tiny head. There is no cure for the disease yet, and no vaccine against the virus has been found either.

“The simple presence of the virus doesn’t mean it caused the birth defect. It means there’s probability,” said Dr. Arnold Monto, a University of Michigan epidemiologist.

In previous Zika outbreaks, there hasn’t been any presence of microcephaly. Babies with this condition have smaller head and often have a smaller and underdeveloped brain. After the virus in the brain tissue, was tested in the lab, a clear presence of microcephaly was found.

Microbiologist Dr. Ernesto Marques, from the University of Pittsburg, said that Zika was being considered as a visible killer, though there were a lot of unanswered questions. He also stated that establishing the cause is like “prosecuting a murder investigation”.

Two of the five women are beyond their 28th week of pregnancy. Tests showed positive results as their undelivered babies had no sign of microcephaly.