HKUMed on COVID-19

03apr-fecal sample


Gastrointestinal manifestations of SARS-CoV-2 infection and virus load in fecal samples from the Hong Kong cohort and systematic review and meta-analysis

Published on Gastroenterology, 03 April 2020

Gut (gastrointestinal) symptoms have been reported in patients infected with SARS-CoV-2. A team of experts from HKUMed found traces of the virus in stool samples from infected patients in Hong Kong. Genetic material of the virus (viral RNA) was detected in 9 of the 59 patients (15.3%) in the study, suggesting that the virus may be able to spread via the ‘fecal-oral route’, whereby the virus is transmitted via unhygienic practices from feces to the mouth, for example: when a person does not wash hands properly after going to the toilet then touches or prepares food that is eaten by other people.

Key takeaways:

  • The virus was found in stool samples even in patients who did not show any gut symptoms.
  • Patients who had diarrhea had more viral RNA in their stool.

The study also analyzed 4,243 patients from 6 countries and found that 17.6% of these patients also had gut symptoms. Common symptoms included eating problems, vomiting, diarrhea and stomachache.

Key takeaways:

  • The disease was more severe in patients who had gut symptoms than those who did not.
  • 48.1% of patients had detectable viral traces in stool when they were ill.
  • 70.3% of patients had viral RNA in their stool even when they tested negative for the virus in their lungs.
  • The virus was still present in stool samples 33 days after the first symptoms appeared.

This work shows that it is reasonable to test patients with gut symptoms for SARS-CoV-2 even when they do not have fever or respiratory symptoms. As the virus persists longer in the gut, healthcare workers must take precautions when collecting stool samples or performing a colonoscopy, a procedure that uses a probe to examine inside the large intestine (colon).