Only two countries in the entirety of the Americas are likely to escape the reach of the mosquito-borne Zika virus - suspected of causing brain damage to babies.
Officials on Monday said they believed only Canada and Chile would escape the spread of the virus as it extends its spread in south, central and north America. It has already been detected in 21 countries and territories of the region since May 2015.
So far, there have been no confirmed cases of anyone being infected with the virus in the US. However, a baby born with an usually small head in Hawaii has triggered a national alert, while Los Angeles County public health officials issued their own warning last Friday after reports of several patients with Zika-symptoms.
Zika has historically occurred in parts of Africa, Southeast Asia and the Pacific Islands. But it is normally a mild disease and there is little scientific data on it, so it is unclear why it might be causing microcephaly in Brazil, the WHO has said.
“Zika has been isolated in human semen, and one case of possible person-to-person sexual transmission has been described,” the WHO said in a statement.
“However, more evidence is needed to confirm whether sexual contact is a means of Zika transmission.”
Battling the zika virus - in pictures
Battling the zika virus - in pictures
A worker of the Salvadorean Ministry of Health fumigates a house in Soyapango, 6 kilometers from San Salvador, El Salvador. Salvadorean authorities have began a three days campaign of fumigation to reduce the presence of the mosquito that transmit the Zika virus.
A Health Ministry employee fumigates a home against the Aedes aegypti mosquito to prevent the spread of the Zika virus in Soyapango, six km east of San Salvador. Health authorities have issued a national alert against the Aedes Aegypti mosquito, because of the link between the Zika virus and microcephaly and Guillain-BarrÈ Syndrome in foetuses.
AFP PHOTO/Marvin RECINOSMarvin RECINOS/AFP/Getty Images
A pediatric infectologist examines a two-months-old baby, who has microcephaly, on 26 January 2016 in Recife, Brazil.
A woman walks through the fumes as Health Ministry employee fumigate against the Aedes aegypti mosquito to prevent the spread of the Zika virus in Soyapango.
Marvin RECINOS/AFP/Getty Images
A health ministry employee sprays to eliminate breeding sites of the Aedes Aegypti mosquito, which transmits diseases such as the dengue, chicunguna and Zica viruses, in a Tegucigalpa cemetery on January 21, 2016. The medical school at the National Autonomous University of Honduras (UNAH) recommended that women in the country avoid getting pregnant for the time being due to the presence of the Zika virus. If a pregnant woman is infected by the virus, the baby could be born with microcephaly.
AFP PHOTO/Orlando SIERRA
A man walks away from his home with his son as health workers fumigates the Altos del Cerro neighbourhood as part of preventive measures against the Zika virus and other mosquito-borne diseases in Soyapango, El Salvador
A three-months-old, who has microcephaly, in Recife, Brazil.
A pregnant woman waits to be attended at the Maternal and Children's Hospital in Tegucigalpa. The medical school at the National Autonomous University of Honduras (UNAH) recommended that women in the country avoid getting pregnant for the time being due to the presence of the Zika virus. If a pregnant woman is infected by the virus, the baby could be born with microcephaly.
ORLANDO SIERRA/AFP/Getty Images
Army soldiers apply insect repellent as they prepare for a clean up operation against the Aedes aegypti mosquito, which is a vector for transmitting the Zika virus in Sao Paulo, Brazil.
AP Photo/Andre Penner
Workers disinfect the Sambadrome in Rio de Janeiro to fight the spread of the Zika virus
Dr. Vanessa Van Der Linden, the neuro-pediatrician who first recognized the microcephaly crisis in Brazil, measures the head of a 2-month-old baby with microcephaly in Recife
Mother Mylene Helena Ferreira cares for her son David Henrique Ferreira, 5 months, who has microcephaly, on January 25, 2016 in Recife, Brazil. In the last four months, authorities have recorded close to 4,000 cases in Brazil in which the mosquito-borne Zika virus may have led to microcephaly in infants
U.S. women who are pregnant from traveling to many South American countries
In the last four months, authorities have recorded close to 4,000 cases in Brazil in which the mosquito-borne Zika virus may have led to microcephaly in infants.
Dr. Vanessa Van Der Linden, the neuro-pediatrician who first recognized the microcephaly crisis in Brazil, examines a two-month-old baby with microcephaly on January 27, 2016 in Recife, Brazil
Brazil is one of the countries in South America where the Zika virus has taken hold
Health workers fumigating to combat Zika virus in Lima, Peru. The US have already issued a warning urging pregnant women to avoid travel to Latin American countries
Two-month-old Jose Wesley, born with microcephaly in Brazil, is nursed by his brother
Reuters said that WHO Director-General Margaret Chan told the WHO executive board that she had asked Carissa Etienne, head of the WHO in the Americas, to brief the board later this week on the WHO's response to the outbreak.
“Although a causal link between Zika infection in pregnancy and microcephaly has not, and I must emphasise, has not been established, the circumstantial evidence is suggestive and extremely worrisome,” Ms Chan said.
“An increased occurrence of neurological symptoms, noted in some countries coincident with arrival of the virus, adds to the concern.“
Brazil has reported 3,893 suspected cases of microcephaly, the WHO said last Friday, over 30 times more than had been reported in any year since 2010.
Colombia, Ecuador, El Salvador and Jamaica last week recommended women delay pregnancies until more was known about the virus.Reuse content