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How to welcome a guest for a few days during Covid-19 if one is vulnerable?

Text updated on 2020-10-31

Welcoming someone into your home and housing them during the COVID-19 epidemic is to run the risk of contaminating yourself or your guest. This risk can be greatly reduced by taking a few precautions, to be dosed according to the fragility of the persons. Maximum caution consists of not standing in the same room, wearing a mask when talking, not eating meals together, and having separate bathrooms. During the stay, everyone will take special care not to contaminate themselves outside the household, so as not to contaminate their host.

It is a bit risky to host a visitor in one's own home (nanny, friends, homestay, hosting refugees, etc.) during the COVID-19 epidemic...and to keep them your house for several days. We can, rightly, fear that they will contaminate us. And if the coronavirus is present in our home without our knowledge, they are the one at risk of being infected.

Here are some practical precautions based on scientific knowledge that can limit the risk, without cancelling it out (this is impossible): those who are frail (elderly or with risk factors) will apply them more carefully and rigorously.

First of all, if the guest is sick (fever and cough suggestive of COVID-19), or if you are sick yourself, it is prudent to cancel the invitation. If no one has any symptoms, however, contamination is still possible: in fact, half of virus carriers are asymptomatic, and it is during the two days preceding their illness that a sick person is most contagious. See the question How long is a person contagious?

Second, contamination is mostly "live" through the particles emitted by one and received by the other, face to face. When we talk to each other, it is therefore prudent to keep the mask on, or to stay at a great distance (more than 2 meters). Contamination is also caused by aerosols emitted while breathing (similar to the cigarette smoke of a smoker), and finally more rarely by viruses deposited by the saliva on objects, and recovered by one's hands then carried to their nose and eyes. See the question How does COVID-19 get caught?

For a shared meal, put a cotton tablecloth on the table (it decontaminates quickly and is easy to wash), keep your distance (ideally 2 meters or more), and avoid talking loudly or upwards (so that any droplets from your mouth will fall onto your own plate). The ideal is to eat outside, otherwise it is good to air the room as much as possible during the meal (and keep warm clothes while eating). If objects (dishes, cutlery) are passed around, you can grab them with a paper towel, or decontaminate your hands afterwards.

So far, no food contamination has been published, so it is likely that this is not an important route. However, the person who prepares and serves the meal will wash their hands thoroughly before and during preparation, and it is best to wear a mask, as is done in collective kitchens. Washing dishes with hot water and detergent, or washing them in a washing machine, will remove the virus well. See the question How to organize a meal at home without risk for the guests?

The guest will be left with a drink glass and some cutlery, which they will not need to wash thoroughly each time they use it.

Finally, everyone will be careful not to contaminate themselves outside the household, and this is a point that must be explained to the guest to encourage them to keep their mask and distance when they go out, even when meeting friends: if they contaminate themselves, they are endangering the lives of the household!

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In Shenzhen, the percentage of household contacts (those sharing a room, apartment, or other sleeping accommodation) whose infection with the SARS-CoV-2 coronavirus was later confirmed, was estimated at 15%.

Bi, Q., Wu, Y., Mei, S., Ye, C., Zou, X., Zhang, Z., ... Feng, T. (2020). Epidemiology and transmission of COVID-19 in 391 cases and 1286 of their close contacts in Shenzhen, China: a retrospective cohort study. The Lancet. Infectious diseases, S1473-3099(20)30287-5.

In Wuhan, an analysis of the close contacts of COVID-19 cases reveals a contamination rate of about 30% in the family at the beginning of the epidemic.

Wang Z, Ma W, Zheng X, Wu G, Zhang R (2020). Household transmission of SARS-CoV-2. J Infect. 81:179-182.

Several cases COVID-19 in January-February 2020 in South Korea were due to contamination following a family meal or at a restaurant/café.

Kong, I., Park, Y., Woo, Y., Lee, J., Cha, J., Choi, J., ... & Kim, T. (2020). Early epidemiological and clinical characteristics of 28 cases of coronavirus disease in South Korea. Osong Public Health Res Perspect, 11(1), 8-14.

Several people from the same family were contaminated after two family dinners.

Ye, F., Xu, S., Rong, Z., Xu, R., Liu, X., Deng, P., ... & Xu, X. (2020). Delivery of infection from asymptomatic carriers of COVID-19 in a family cluster. Int. J. Infect. Say.

Several cases of contamination at family meals in China.

Liu, Y., Eggo, R. M., & Kucharski, A. J. (2020). Secondary attack rate and superspreading events for SARS-CoV-2. The Lancet, 395(10227), e47.

Coronavirus is present in the stool of COVID-19 patients.

Wu, Y., Guo, C., Tang, L., Hong, Z., Zhou, J., Dong, X., ... & Kuang, L. (2020). Prolonged presence of SARS-CoV-2 viral RNA in faecal samples. The Lancet Gastroenterology & Hepatology, 5(5), 434-435.

During the SARS outbreak in 2003 (this is NOT the COVID-19), 99 people living in the same building were contaminated from an infected person who had diarrhea. The study shows that flushing the toilet caused aerosolization of viral particles in the stool of the infected person. These particles were then spread through ventilation to the apartments on the upper floors.

Yu, I. T., Li, Y., Wong, T. W., Tam, W., Chan, A. T., Lee, J. H., ... & Ho, T. (2004). Evidence of airborne transmission of the severe acute respiratory syndrome virus. New England Journal of Medicine, 350(17), 1731-1739.

Even after flushing the toilet several times, some of the viral particles are still present in the water in the toilet bowl. In addition, when you flush the toilet, many droplets containing bacteria and viral particles are formed and can end up more than one meter from the toilet bowl.

Gerba, C. P., Wallis, C., & Melnick, J. L. (1975). Microbiological hazards of household toilets: droplet production and the fate of residual organisms. Appl. approx. Microbiol, 30(2), 229-237.

Further reading

Can SARS-CoV-2 coronavirus be caught by eating?

How does she get COVID-19 ?

Can we catch COVID two times?

How to flirt in the time of COVID-19 ?

We are planning a family reunion for the holidays: how to do it?

Can the SARS-CoV-2 coronavirus be caught by going to the bathroom?

What should I do if I find out that I recently have been in contact with someone who has just tested positive?

Coronaviruses and animals: what are the risks of contamination and transmission COVID-19 with respect to species?