However, it is not yet clear to what degree contracting Covid-19 confers immunity, with early studies suggesting a few months while newer ones have indicated it could last longer.
Meanwhile, a study by Australia's national science agency found the coronavirus that causes Covid-19 can survive on items such as banknotes and phones for up to 28 days in cool, dark conditions.
Researchers at CSIRO's disease preparedness center tested the longevity of SARS-CoV-2 in the dark at three temperatures, showing survival rates decreased as conditions became hotter.
(Writer: Sébastien Ricci, with AFP bureaus)
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