write an essay about causes of covid -19
Answers
Explanation:
Coronavirus disease 2019 (COVID-19), also known as the coronavirus or COVID, is a contagious disease caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). The first known case was identified in Wuhan, China, in December 2019.[7] The disease has since spread worldwide, leading to an ongoing pandemic.[8]
Coronavirus disease 2019
(COVID-19)
Other names
COVID, (the) coronavirus
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Transmission and life-cycle of SARS-CoV-2 causing COVID-19.
Pronunciation
/kəˈroʊnəˌvaɪrəs dɪˈziːz/
/ˌkoʊvɪdnaɪnˈtiːn, ˌkɒvɪd-/[1]
Specialty
Infectious disease
Symptoms
Fever, cough, fatigue, shortness of breath, vomiting, loss of taste or smell; some cases asymptomatic[2][3]
Complications
Pneumonia, viral sepsis, acute respiratory distress syndrome, kidney failure, cytokine release syndrome, respiratory failure, pulmonary fibrosis, pediatric multisystem inflammatory syndrome, chronic COVID syndrome
Usual onset
2–14 days (typically 5) from infection
Duration
5 days to 10+ months known
Causes
Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2)
Diagnostic method
rRT-PCR testing, CT scan
Prevention
Face coverings, quarantine, physical/social distancing, ventilation, hand washing,[4] vaccination[5]
Treatment
Symptomatic and supportive
Frequency
151,748,334[6] confirmed cases
Deaths
3,187,854[6]
Symptoms of COVID-19 are variable, but often include fever,[9] cough, headache,[10] fatigue, breathing difficulties, and loss of smell and taste.[11][12] Symptoms may begin one to fourteen days after exposure to the virus. At least a third of people who are infected do not develop noticeable symptoms.[13] Of those people who develop noticeable symptoms enough to be classed as patients, most (81%) develop mild to moderate symptoms (up to mild pneumonia), while 14% develop severe symptoms (dyspnea, hypoxia, or more than 50% lung involvement on imaging), and 5% suffer critical symptoms (respiratory failure, shock, or multiorgan dysfunction).[14] Older people are at a higher risk of developing severe symptoms. Some people continue to experience a range of effects (long COVID) for months after recovery, and damage to organs has been observed.[15] Multi-year studies are underway to further investigate the long-term effects of the disease.[15]
Answer:
Popularly called Coronavirus in reference to the city where it originated and where most cases are being registered in 2019-nCoV reminds of infections such as the Middle East coronavirus respiratory syndrome (MERS) or acute severe respiratory syndrome ( SARS). These types of epidemics are usually caused by virus from animals that mutate and end up being transmitted to other living things. A group of researchers from the Agricultural University of South China (SCAU) has determined that pangolins, mammals similar to armadillos whose meat is considered a delicacy in China, have been able to act as “intermediate hosts” of the coronavirus.
A first investigation carried out by Chinese scientists suggested that the virus could come from a snake. After locating the germ they have managed to study it to try to determine where it came from and the reasons for its virulence. After comparing it with other known coronaviruses, they soon found that the virus was the mixture of one originating from bats but mixed with another of unknown origin. And that recombination of RNA went to snakes, as explained in the study published in the ‘Journal of Medical Virology’.
Although it is not yet known precisely, the coronavirus is transmitted mainly through contact with infected animals or through close contact with the respiratory secretions that are generated with the cough or sneeze of a sick person. On the other hand, the Chinese National Health Commission has just discovered that physical contact is another way of spreading. The World Health Organization (WHO), which a week ago declared the global health emergency, has asked the international community to redouble its efforts, especially considering that the data of deaths from the outbreak of the new coronavirus exceed those registered because of the outbreak of SARS or acute respiratory syndrome, which in 2003 caused the death of 765 people worldwide.