LIMA - Peruvian officials have declared a Zika health emergency across the northern half of their country after confirming that 102 people have been infected with the virus. The 90-day emergency was announced in the official gazette El Peruano, which said the health ministry and local authorities were working to prevent the spread of the disease, which is principally transmitted by mosquitos.

The cases detected so far include 34 pregnant women. Zika is seen as a cause of microcephaly - abnormally small heads and brains - in babies.