COVID-19 (COrona VIrus Disease-2019) Тема - 3

In brief, the study showed that SARS-CoV can survive on inanimate surfaces and remain infectious for several days. The infectivity of the virus was strongly reduced following
heating or UV irradiation

In January 2020, Kampf and co-workers reviewed literature about the persistence of
coronaviruses (3). The authors included 22 studies. None of the included studies investigated SARS-CoV-2, but data from SARS-CoV, MERS-CoV and other coronaviruses suggests these viruses can persist on inanimate surfaces (metal, glass or
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plastic) for up to nine days. However, the viruses seem to be efficiently removed following some standard disinfection procedures.

Otter and colleagues published a systematic review based on simple searches in PubMed (5). The authors aimed to assess the role of dry surface contamination in transmission of SARS-CoV and MERS-CoV. There are methodological differences between the available primary studies, but in-vitro studies suggest MERS-Cov and
SARS-CoV can survive on dry surfaces for a longer period of time than influenza virus and other human coronaviruses (days vs. hours) (5). Survival time depends on
the surface material, and more concentrated viral suspensions seem to survive
longer. The review authors further state that “…two studies have detected environmental reservoirs of SARS-CoV RNA by PCR, but no viable virus by culture.” The
authors conclude that SARS-CoV may transmit by direct contact, indirect contact,
droplets and aerosols, but that the relative importance of these routes is difficult to
determine.

Five of the included primary studies traced transmission in clusters of patients infected with SARS-CoV-2 (Table 1). The studies show that transmission usually occur
between people who are in close contact, but there were some cases where spread
may have been by indirect transmission through contaminated inanimate surfaces
(fomites). Even though these studies are not designed to differentiate between various routes of transmission, the results indicate that SARS-CoV-2 can be transmitted
in the community by a combination of droplets, direct and indirect contact.

Systematic reviews conclude that viruses that resembles SARS-CoV-2, i.e. SARS-CoV
and MERS-CoV, are likely to transmit through a combination of different transmission paths. Currently available evidence suggests this is the case also for SARS-CoV2. The virus seems to transmit between closely related individuals, but indirect
transmission through inanimate surfaces (fomites) may also occur. It is very challenging, however, to acquire evidence regarding the relative importance of different
transmission paths. People in close relations and people staying in close proximity to
each other are likely to be exposed to multiple potential ways of transmission.

Ето да си прочетеш цялото, за да видиш, че има документирани случаи на заразяване чрез заразени повърхности.

https://www.fhi.no/globalassets/dokumenterfiler/rapporter/2020/c … 2-report-2020.pdf