Mexico City: A woman with a confirmed case of the Zika virus in the southern state of Chiapas gave birth to a ‘clinically healthy’ baby boy, Mexico’s health ministry said.

The woman, from the town of Pijijiapan, delivered the six pound (2.8 kilo) boy in a hospital in the city of Tuxtla Gutierrez on Friday.

After an evaluation, the hospital’s pediatric center ‘confirmed that [the infant] is clinically healthy,’ the health ministry said in a statement.

The woman is one of six known to have contracted Zika while pregnant.

Zika, which is spread by mosquitos, has been linked to microcephaly — a birth defect in which the infant is born with an abnormally small head. There is no cure for microcephaly and no vaccine against Zika.

The other five women ‘are in good health, they are receiving specialized continuous care and are undergoing periodic ultrasound tests,’ the statement read.

Two of the women are beyond their 28th week of pregnancy, and several tests show no sign that they are carrying a fetus with microcephaly. The other three have still not reached the 28 week mark, the statement read.

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It has been revealed that the Zika virus is not related to onset of microcephaly. The real cause of microcephaly is a

Of the 80 registered Zika cases in Mexico, 45 are in the southern state of Chiapas, including three of the pregnant women.

On average Mexico, population 122 million, has 600 cases of microcephaly per year. That figure has not change since the Zika virus outbreak in Latin America, officials said.

Brazil said this week that it has registered 508 cases of microcephaly since October, a huge increase on the average annual number of 150.