The testicles may harbour coronavirus and give it a sanctuary from the immune system which allows the infection to persist for longer in males, a study has suggested.

When Covid-19 enters the body it binds with cells expressing the ACE2 protein, or angiotensin converting enzyme 2.

These are found in the lungs, heart and intestines. In men the protein is also found in large quantities in the testes whereas, in women, very small amounts are found in ovarian tissue.

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