Two hundred cases of the Zika virus have been confirmed and thousands are suspected in Cape Verde in the first African outbreak of the strain of the disease that has hit South America, the World Health Organisation has revealed.

Three cases of babies with microcephaly – an unusually small head associated with incomplete brain development – have already been discovered on the island off Senegal on Africa’s west coast with 170 pregnant women among those infected.

A WHO spokesman said more than 7,500 people were suspected of having the Asian strain of the disease, but the diagnosis had yet to be confirmed.

There is an African strain of the Zika virus but it is feared that this will not confer immunity from the Asian version.

Dr Matshidiso Moeti, WHO’s regional director for Africa, said: “The findings are of concern because it is further proof that the outbreak is spreading beyond South America and is on the doorstep of Africa.

“This information will help African countries to re-evaluate their level of risk and adapt and increase their levels of preparedness.”

In a statement, the WHO confirmed this was “first time that the Zika strain responsible for the outbreaks linked to neurological disorders and microcephaly has been detected in Africa”.

The global health body advised countries in the area to raise awareness of the disease, particularly among pregnant women and “promote protection steps to avoid mosquito bites as well as sexual transmission”.

“In addition, countries should increase their surveillance for Zika transmission and congenital malformations, such as microcephaly, as well as Guillain-Barré syndrome,” the statement said.

Professor Paul Hunter, an expert in health protection at the University of East Anglia, told The Independent that the disease would "almost certainly" now spread to continental Africa in what he predicted could become a major disaster.

"Once it has got a toe-hold in Africa, it is likely to spread pretty dramatically," he said.

"It's potentially going to be even a bigger disaster than in South America.

"I'm pretty sure the WHO are taking it very seriously."

The Zika virus - in pictures Show all 5 1 /5 The Zika virus - in pictures The Zika virus - in pictures A three-month-old, who has microcephaly, in Recife, Brazil. A rise in microcephaly cases is thought to have been caused by the spread of the Zika virus in affected countries Getty Images The Zika virus - in pictures A mother holds her baby who has microcephaly Getty Images The Zika virus - in pictures A five-month-old baby, who has microcephaly, in Recife, Brazil Getty Images The Zika virus - in pictures A pediatric infectologist examines a two-month-old baby, who has microcephaly, in Recife, Brazil Getty Images The Zika virus - in pictures A baby affected with microcephaly

While there might be little risk to people in dry places like Niger and Chad, Professor Hunter said the inhabitants of countries with wet climates where mosquitoes flourish, such as the Democratic Republic of Congo, Uganda, Tanzania, Kenya, Zimbabwe and "even South Africa", could all be affected.

He said the African strain of Zika might also cause microcephaly but because people tend to catch it as children, women tend to be immune when they became pregnant.

Professor Hunter said that the African strain might confer some immunity against the Asian version, but might also make things worse.

For example, catching one version of dengue fever gives immunity to a different strain for about 10 to 15 years, he said, but those infected after that period experience a more severe illness.

Only on Wednesday, the WHO warned that the virus could come to Europe.

Zika virus could spread to Europe say WHO

Its regional director for Europe, Zsuzsanna Jakab, said: “There is a risk of spread of Zika virus disease in the European Region and ... this risk varies from country to country.

"We call particularly on countries at higher risk to strengthen their national capacities and prioritize the activities that will prevent a large Zika outbreak."