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People who've already had the original omicron can also be infected by the latest mutations of the variant, B.A.4 and B.A.5.
Two new sublineages of the Omicron coronavirus variant can dodge antibodies from earlier infection well enough to trigger a new wave, but are far less able to thrive in the blood of people vaccinated against Covid-19.
An expert has warned being infected with COVID-19 for a second time will become increasingly common as new highly transmissible Omicron sub-lineages emerge.
An increasing share of SA's Covid-19 cases are the BA.4 and BA.5 sub-lineages of the Omicron variant.
COVID-19: People with double vaccination and booster shots are also falling prey to the highly infectious variant Omicron due to various reasons. Currently, Omicron BA.2 is dominant worldwide including in India.