Coronavirus Overview For 2022
A recent study reported that human coronaviruses (hCOV) were cultured in the 1960s from nasal cavities of people with the common cold. Coronaviruses are the second leading cause of the common cold after rhinoviruses. According to the U.S. CDC, people commonly get infected with human coronaviruses 229E, NL63, OC43, and HKU1.
The International Committee for the Taxonomy of Viruses approved naming more than 40 coronaviruses. The four main sub-groupings of coronaviruses are alpha, beta, gamma, and delta. Betacoronaviruses are microscopic balls covered in spikes that encapsulate a central core of genetic material. The virus must infect cells to replicate and do this, and it must first attach to the cells.
The U.S. CDC and the NIH reported that SARS-CoV-2 originated in 2019 but has now spread internationally, impacting most countries. On February 5, 2020, JAMA published a study from genetic sequencing data, showing this betacoronavirus shares 79.5% of the genetic sequence with SARS-CoV-1 and has 96.2% homology to a bat coronavirus. This finding indicates that SARS-CoV-1 and SARS-CoV-2 are not the same coronaviruses.
The emergence of the betacoronavirus Middle East Respiratory Syndrome (MERS) was first reported in the Kingdom of Saudi Arabia in 2012. Humans are infected with MERS-CoV from direct or indirect contact with dromedaries. In addition, MERS-CoV has demonstrated the ability to transmit between humans.
An importation of MERS into the Republic of Korea in 2015 led to the largest MERS outbreak outside of the Middle East. By the outbreak's end, 186 laboratory-confirmed cases (185 in the Republic of Korea and 1 in China) and 38 deaths had been recorded.
SARS-CoV-2 Virus Immunity
Various types of immunity from disease, such as vaccine-induced and post-infection, are listed on this webpage.
There are various types of diagnostic tests, which are listed on this webpage.
Note: This content is sourced from the U.S. CDC, the WHO, and research studies and is reviewed by health professionals.