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The World Health Organization (WHO) has warned that Zika virus is likely to spread across nearly all of the Americas.

The Zika virus, which causes symptoms including mild fever, conjunctivitis and headache, has already been found in 21 countries in the Caribbean, North and South America.

It has been linked to thousands of babies being born with underdeveloped brains and some countries have advised women not to get pregnant.

No treatment or vaccine is available.

The Zika virus was first detected in 1947 in monkeys in Africa. There have since been small, short-lived outbreaks in people on the continent, parts of Asia and in the Pacific Islands.

It has spread on a massive scale in the Americas, where transmission was first detected in Brazil in May 2015.

Large numbers of the mosquitoes which carry the virus and a lack of any natural immunity is thought to be helping the infection to spread rapidly.

Zika is transmitted by the bite of Aedes mosquitoes, which are found in all countries in the region except Canada and Chile.

Photo AFP

Photo AFP

In a statement, the Pan American Health Organization (PAHO), the regional office of the WHO, said: “PAHO anticipates that Zika virus will continue to spread and will likely reach all countries and territories of the region where Aedes mosquitoes are found.”

PAHO is advising people to protect themselves from the mosquitoes, which also spread dengue fever and chikungunya.

It also confirmed the virus had been detected in semen and there was “one case of possible person-to-person transmission” but further evidence was still needed.

Around 80% of infections do not result in symptoms.

However, the biggest concern is the potential impact on babies developing in the womb. There have been around 3,500 reported cases of microcephaly – babies born with tiny brains – in Brazil alone since October.

PAHO warned pregnant women to be “especially careful” and to see their doctor before and after visiting areas affected by the Zika virus.

Colombia, Ecuador, El Salvador and Jamaica last week recommended women delay pregnancies until more was known about the virus.

Although officially PAHO says “any decision to defer pregnancy is an individual one between a woman, her partner and her healthcare provider”.

Prof. Laura Rodrigues, a fellow of the Brazilian Academy of Sciences and from the London School of Hygiene and Tropical Medicine, said some data suggested that up to one-in-fifty babies had birth defects in one of the worst hit areas – Pernambuco state in Brazil.

She said: “Until November we knew nothing, this has caught us by surprise and we’re trying to learn as fast as we can.

“Wherever there is dengue, there is mosquito, then it will spread and not just in Americas I think there is a very real chance it will spread in Asia.”

PAHO advice is to ensure all containers that can hold even small amounts of water should be emptied and cleaned to prevent mosquitoes breeding.

People should protect themselves by using insect repellent, covering up and keeping windows and doors closed.

According to health officials, the number of suspected and confirmed cases of chikungunya virus in Caribbean countries has risen sharply over past weeks.

Tens of thousands of new cases have been reported in the Dominican Republic and its neighbor, Haiti.

There is currently no vaccine or treatment for the mosquito-borne virus which resembles dengue fever and can cause fever, skin rash and joint pain.

European health authorities have warned travelers to take extra precautions.

The number of suspected and confirmed cases of chikungunya virus in Caribbean countries has risen sharply over past weeks

The number of suspected and confirmed cases of chikungunya virus in Caribbean countries has risen sharply over past weeks

The European Centre for Disease Prevention and Control told people travelling to the Caribbean to apply insect repellent and avoid mosquito bites.

France has detected more than 70 imported cases of chikungunya, mainly in people returning from holidays in the French Antilles.

The Centre said there was a risk the virus could spread in Europe if infected patients were bitten by mosquitoes upon their return home and those mosquitoes then infected other people.

There are also signs chikungunya is spreading further to Central and South America.

According to the latest figures released by the Pan American Heath Organization (PAHO), almost 265,000 suspected and confirmed cases have been recorded since the outbreak began in December.

More than half of those have been in the Dominican Republic, which has stepped up its fumigation efforts in an attempt to reduce the number of mosquitoes.

Health officials warn that the true numbers may be much higher as some countries have been slow in testing and reporting cases.

Chikungunya is rarely fatal but according to the PAHO, 21 people have died in the Caribbean after contracting the virus.

There have also been cases in Central America, with El Salvador the hardest hit with 1,300 suspected incidences.

Paraguay recorded its first citizen with the virus on Tuesday, but said the man had contracted it while travelling in the Dominican Republic.

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