By AGENCE FRANCE PRESSE, NAIROBI, Kenya, Feb 4 – The world’s latest health scare is Zika: a tropical, mosquito-borne virus that holds little danger for most people, but could completely derail the lives of some.
Most often, the virus which is sweeping Latin America causes only mild symptoms — with many people never even realising they have it.
But health officials suspect it may be behind a surge in cases of microcephaly, a condition which causes babies to develop abnormally small brains and skulls — leading to permanent disability or death.
The outbreak has seen some countries urging couples not to get pregnant, while the US Centers for Disease Control (CDC) has warned pregnant women to avoid travelling to 22 affected nations.
On Tuesday, US health authorities confirmed the virus had been transmitted by sexual contact — by someone infected in Venezuela who came home to a partner in Texas.
Here’s what we know about the virus.
– What is Zika? –
The virus gets its name comes from a forest in Uganda where it was first discovered in infected rhesus monkeys in 1947. Within years, the virus had spread to humans in Uganda and Tanzania, according to the World Health Organization (WHO).
Like dengue fever and chikungunya, two similar diseases, Zika is transmitted by mosquito species found in tropical and sub-tropical regions: Aedes aegypti and Aedes albopictus, or tiger mosquitoes.
– How do I know if I have it? –
In 70 to 80 percent of cases, the disease goes unnoticed. The symptoms resemble those of a mild case of the flu — headache, muscle and joint pain, and mild fever — plus a rash.
Symptoms last about two to seven days.
– Why are experts worried? –
The virus is suspected of causing two serious complications, though it has not been scientifically linked to either: microcephaly in babies, and Guillain-Barre syndrome.
A surge in microcephaly and other brain deformities in newborns has been reported in areas hit by the current Zika outbreak, particularly in Brazil.
Microcephaly cases in the South American country surged from 163 live births on average per year, to more than 4,000 in the current outbreak. Forty-nine babies have died.
Many foetuses die in the womb.
Guillain-Barre is a disorder in which the immune system attacks the nervous system, causing muscle weakness and sometimes paralysis.
Most patients recover, but the syndrome can sometimes be deadly. Cases believed to be linked to Zika have been reported in Brazil and French Polynesia.
– What to do? –
There is no vaccine for Zika, and no treatment — patients can take pain-killers and other medication to relieve the symptoms.
The virus is transmitted mainly through mosquito bites, so killing mosquitoes and avoiding contact with them is key. Health officials recommend covering up, using insect repellant and keeping windows closed or screened.
Authorities have responded to the outbreak by fumigating and getting rid of standing water where mosquitoes breed.
And officials in Brazil, Colombia, Ecuador, El Salvador and Jamaica have advised couples not to fall pregnant at this time.
Brazil has announced a crackdown on mosquito breeding grounds ahead of the Olympics, which will bring hundreds of thousands of travellers from around the world to Rio de Janeiro in August.
– Where is Zika now? –
The virus was first reported in Africa, Asia and the Pacific before leaping to the Americas last year.
The Aedes aegypti mosquito’s habitat, mainly in tropical zones, stretches as far as the southern United States and into southern Europe.
On Monday, the WHO said Zika constitutes a “public health emergency of international concern”.
It is now present in some 20 Latin American and Caribbean countries. Brazil has been the hardest hit, with almost 1.5 million infections.
Travellers have brought it back to the US states of Florida, Hawaii, New York, and Texas.
In Hawaii, a woman who had contracted Zika in Brazil gave birth to a baby with microcephaly.
Cape Verde, Indonesia, Thailand and islands in the French Caribbean have also reported Zika infections.
View of the Aedes Aegypti mosquito larva in a laboratory in San Salvador, El Salvador, on 07 February 2016. EPA/Oscar Rivera
Members of Sao Paulo Health Municipality Secretary dressed as mosquitoes promote the campaign ‘More health for the city’ to raise awarness for the fight against the Zika, Dengue and Chikunguna viruses, in Sao Paulo, Brazil, 04 February 2016. The health ministers of 14 Latin American countries on 03 February 2016 agreed on a roadmap to fight the Zika virus, linked in Brazil to a dramatic increase of birth defects. EPA/SEBASTIAO MOREIRA
A Cambodian health official searches for mosquitos in a house in Phnom Penh, Cambodia, 04 February 2016. Cambodian health officials collected mosquitos and larva as part of a prevention initiative to halt the spread of the Zika virus after the World Health Organisation (WHO) declared a public health emergency. EPA/MAK REMISSA
An employee of the muncipality of Chacao fumigates a church during efforts to prevent the possible spread of the Zika virus in the country, in Caracas, Venezuela, 05 February 2016. EPA/MIGUEL GUTIERREZ
An employee of the muncipality of Chacao fumigates outside a church during efforts to prevent the possible spread of the Zika virus in the country, in Caracas, Venezuela, 05 February 2016. EPA/MIGUEL GUTIERREZ
A Health Secretary public worker fumigates at a cemetery during efforts to prevent a possible spread of the Zika virus in the country, in Oaxaca, southern Mexico, 05 February 2016.
A handout picture released by the Honduran Presidential House shows an employees of the Honduran government fumigating an area during a campaign preventing the possible spreading of the Zika virus (ZIKV) and against mosquito breeding sites, in Catacamas, Honduras, 06 February 2016. The outbreak of the normally harmless fever in the Americas has coincided with rising numbers of suspected cases of microcephaly. Babies born with microcephaly have abnormally small heads. Some governments in the region have recommended that women should not get pregnant now. EPA/HONDURAN PRESIDENTIAL HOUSE HANDOUT EDITORIAL USE ONLY/NO SALES
An employee of the Guatemalan Health Ministry fumigates against Aedes Aegypti, mosquitoes spreading the Zika virus (ZIKV), at a poor neighborhood in Guatemala City, Guatemala, 05 February 2016. The Guatemalan government has reported 112 cases of people infected with ZIKV, seven of them are pregnant women. The outbreak of the normally harmless fever in the Americas has coincided with rising numbers of suspected cases of microcephaly. Babies born with microcephaly have abnormally small heads. Some governments in the region have recommended that women should not get pregnant now. EPA/ESTEBAN BIBA
A photograph made available 04 February 2016 shows a signboard in front of the Zika Forest, which is owned by the Uganda Virus Research Institute (UVRI), near Entebbe, some 30km south of the capital Kampala, Uganda, 03 February 2016. The Zika virus was first discovered in this small forest in 1947 and was named after it. The forest is little-known even locally and small attention has been paid to it. The virus, which is transmitted by Aedes aegypti mosquitos, is suspected of causing birth defects through mother-to-child transmission but the link has not yet been proven. EPA/STR
Laboratory employee Louise Zech cultivates cells infected with the Zika virus at the laboratory of the company Euroimmun in Dassow, Germany, 05 February 2016. Brazilian authorities use diagnostic technology produced by the German company Euroimmun AG in the fight against the Zika virus. EPA/DANIEL BOCKWOLDT
The newly-launched hatchback car ?Zica’ at the Indian Auto Expo in Greater Noida, Uttar Pradesh, outskirts of New Delhi, India, 03 February 2016. Indian automobile maker Tata Motors has decided to rename the new small car Zica given its similarity to the Zika virus spreading across the globe. Tata Motors came up with the Zica name months ago with the word coming from ‘zippy car.’ EPA/HARISH TYAGI