Zika

[[File:ZIKA.png|thumb|right|165px|Symptoms of Zika infection]]{{biology}}
'''Zika''' is a [[virus]] from the same genus as {{wpl|dengue fever}} (''Flavivirus''). It is transmitted by the mosquitoes ''Aedes aegypti'' and ''A. albopictus'',<ref>Gilda Grard, et al. "Zika virus in Gabon (Central Africa) – 2007: A new threat from ''Aedes albopictus''?" ''PLOS Neglected Tropical Diseases'' 6 February 2014;8(2):e2681. doi: 10.1371/journal.pntd.0002681</ref> present in tropical and subtropical regions around the world, and has attracted attention after a 2015 and 2016 outbreak in the Americas.

==History==
The Zika virus was first isolated in Africa in 1947, but the first known human infection was in Federated States of Micronesia on Yap Island in 2007.<ref>[https://www.nejm.org/doi/full/10.1056/NEJMoa0805715 Zika Virus Outbreak on Yap Island, Federated States of Micronesia] by Mark R. Duffy, et al. (2009) ''N. Engl. J. Med.'' 360: 2536-2543. DOI: 10.1056/NEJMoa0805715.</ref> It has probably arrived in [[Brazil]] during the 2014 World Cup, brought by a tourist. Due to the abundance of the ''Aedes'' mosquito, it has found fertile ground and spread through the continent.

==Birth defects==
While Zika virus has mild symptoms, many times not experienced at all, it is thought to be related to birth defects such as microcephaly, which causes babies to be born with small heads. The disorder may lead to developmental delays and intellectual deficits, although damage may be reduced with early stimulation.

The evidence for Zika causing birth defects comes from the surge of microcephaly in babies whose mothers were infected by Zika in 2015 and 2016. In previous years, there were around 150 cases of microcephaly, a number that soared to thousands after the outbreak. Since the virus gained notoriety recently, it is not yet scientifically known how Zika infects the fetus. Its mechanism is still being studied and some discoveries have already been made, such as the presence of the virus in the placenta, identified by Brazilian researchers in January 2016.

El Salvador has advised women to not get pregnant until 2018, but at the same time offers no family planning to its people, imprisoning women for miscarriages.{{cn}} Many of the [[Latin America]]n countries do not allow [[abortion]]s, leading to a debate whether it should be legalized for microcephaly cases, following a recommendation from the United Nations.<ref>[http://www.theguardian.com/world/2016/feb/05/zika-virus-epidemic-abortion-birth-control-access-latin-america-united-nations UN tells Latin American countries hit by Zika to allow women access to abortion]</ref> As of 2016, Latin American Catholic bishops have begun to reiterate their opposition to [[birth control]] and abortion in all cases.<ref name=nytimes2016>[http://www.nytimes.com/2016/02/14/world/americas/catholic-leaders-say-zika-doesnt-change-ban-on-contraception.html?_r=0 Catholic Leaders Say Zika Doesn’t Change Ban on Contraception] by Laurie Goodstein (Feb. 13, 2016) ''New York Times.</ref> Bishop Leonardo Ulrich Steiner, the secretary general of the National Council of Bishops of Brazil, instead urged couples to use 
Vatican roulette
 [[natural family planning]].<ref name=nytimes2016/>

==Sexual transmission==
Although mainly spread by the ''Aedes aegypti'' mosquito, it is probable that Zika is sexually transmitted. In 2008, an American biologist contracted the disease after studying mosquitoes in Senegal and transmitted it to his wife after unprotected intercourse. Since then, the virus has been found in semen and new cases of sexual transmission were registered in 2016. Both sexual and human-to-human blood transmissions have been reported.<ref>[http://www.cdc.gov/zika/transmission/ Zika virus] Centers for Disease Control.</ref>

Furthermore, Zika virus was found by Brazilian researchers in other body fluids, such as saliva and urine.<ref>[http://uk.reuters.com/article/us-health-zika-brazil-idUKKCN0VE1QQ Brazil finds Zika in saliva, urine; expert warns against kissing]</ref>

==Conspiracy theories==
Since its outbreak, Zika virus has been the subject of [[conspiracy theories]]. One of them claims microcephaly is caused not by Zika virus, but by the [[Anti-vaccination movement|rubella vaccine]]. However, this vaccine is contraindicated for pregnant women and thus was never distributed to them. Moreover, there is no link between vaccines and microcephaly.

Another conspiracy theory blames [[Genetic modification|genetically modified]] mosquitoes for causing the Zika outbreak. Not only is this far from the truth, it's the polar opposite of the truth. Defective male GM mosquitoes were released in some regions of Brazil in order to decrease the ''Aedes aegypti'' population.  These males contained genes that, without laboratory conditions, could only produce male offspring. The males would mate with wild females, and the next generation would be virtually all male, and there would be little third generation. For those that weren't aware, male mosquitoes ''don't bite''. Other mosquitoes were released carrying the ''{{wpl|Wolbachia}}'' [[bacteria]], which reduces their ability to spread diseases.<ref>[https://www.worldmosquitoprogram.org/en/work/wolbachia-method/how-it-works Wolbachia method: How it works]. World Mosquito Program.</ref>

==See also==
*[[Swine flu]]
*[[Ebola]]
*[[Virus]]

==References==
{{reflist|2}}

[[Category:Medicine]]
[[Category:Disease]]
[[Category:Media hysteria]]
[[Category:Viruses]]

Categories: Medicine, Disease, Media hysteria, Viruses