Four of the 7 coronaviruses most frequently cause symptoms of the common cold. Coronaviruses 229E and OC43 cause the common cold; the serotypes NL63 and HUK1 have also been associated with the common cold. Rarely, severe lower respiratory tract infections, including pneumonia, can occur, primarily in infants, older people, and the immunocompromised.
Three of the 7 coronaviruses cause much more severe, and sometimes fatal, respiratory infections in humans than other coronaviruses and have caused major outbreaks of deadly pneumonia in the 21st century:
SARS-CoV-2 is a novel coronavirus identified as the cause of coronavirus disease 2019 (COVID-19).
These coronaviruses that cause severe respiratory infections are zoonotic pathogens, which begin in infected animals and are transmitted from animals to people. SARS-CoV-2 has significant person-to-person transmission.
Information Source: Coronaviruses and Acute Respiratory Syndromes (COVID-19, MERS, and SARS) By Brenda L. Tesini , MD, University of Rochester School of Medicine and Dentistry Last full review / revision Jul 2020| Content last modified Jul 2020
Some viruses, such as the new coronavirus SARS-CoV-2 (COVID-19), SARS-CoV, Ebola virus, H5N1, etc., are highly infectious and highly pathogenic, which have brought great difficulty and danger to the screening of neutralizing antibodies. Compared with natural virus, the pseudovirus can only infect cells in a single round, has broad host range, high titer, and is not easily inactivated by serum complement.
In the pseudovirus luciferase assay (PVLA), the inhibition of viral entry into cells by NtAb is correlated to the decreased levels of luciferase signals in the cells. This method is superior to the conventional assay because of its simplicity, higher sensitivity and accuracy, suitability for high-throughput experiments. In addition, no live virus is used during the test. Therefore, this method could be used as an alternative for safely conducting serologic studies in a rapid response in assessing the threat posed by SARS-CoV-2.
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UV-C is a short-wave ultraviolet light with a wavelength between 100-280 nanometers. It is naturally emitted from the sun and blocked by the earth’s atmosphere
Since the light penetrates the mold cells and damages the nucleic acids directly, the mold cells will die off after a period of an hour or two eventually.
Since the UV-C radiation does not penetrate the skin, there will be no harm to the body or baby. Regardless of the time, you were exposed to the UV-C light. As a public health message, other types of UV radiation (UV-A and UV-B) are considered hazardous, and one should minimize the amount of time of exposure. According to the World Health Organization (WHO), UV-A radiation is associated with skin cancers (http://www.who.int/uv/health/en/).
To summarize, UV-C rays or radiation is produced by the sun and by particular kinds of lightbulbs. UV-C radiation from lightbulbs is used to sterilize surfaces and air. However, it cannot penetrate the dead layer of skin that lines the surface of the body. Since the radiation cannot penetrate the body, there is no effect of the UV-C light on an unborn baby.