Stability of SARS-CoV-2 varies in different body secretions, environmental conditions and surfaces. However, it is crucial to understand the viability of SARS-CoV-2 in the respiratory or GI tract for successful postmortem specimen collection.
As mentioned in Page 2, and under the title "Specific risks related to the handling bodies of deceased persons with suspected or confirmed COVID-19":
"There is no evidence so far of transmission of SARS-CoV-2 through the handling of bodies of deceased persons. The potential risk of transmission related to the handling of bodies of deceased persons with suspected or confirmed COVID-19 is considered low and can be related to:
* direct contact with human remains or bodily fluids where the virus is present
* direct contact with contaminated fomites.
As viable SARS-CoV-2 may persist on surfaces for days, there is the possibility that the virus also persists on deceased bodies."
The interim guidance released by the WHO titled "Infection Prevention and Control for the safe management of a dead body in the context of COVID-19":
"Except in cases of hemorrhagic fevers (such as Ebola, Marburg) and cholera, dead bodies are generally not infectious. Only the lungs of patients with pandemic influenza, if handled improperly during an autopsy, can be infectious. Otherwise, cadavers do not transmit disease. It is a common myth that persons who have died of a communicable disease should be cremated, but this is not true. Cremation is a matter of cultural choice and available resources."
Thank you for your answer, very helpful. Yes, there is no sufficient data to date on viability of SARS-CoV2 in the respiratory tract of the deceased, however, I guess more data will be coming out very soon.