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Reinfection from new Omicron variants and rising hospital Covid cases prompts booster warning  

New Covid-19 subvariants have led to rising case numbers and hospitalisations from the virus, prompting fresh warnings from experts.

The BA.2 strain of Omicron is still the most dominant in Australia, but an increasing number of infections are of the BA.4 or BA.5 strain – which is on the rise in the UK and the US. 

The new strains have been shown to lead to re-infection of those who previously recovered from Covid. 

‘We are seeing reinfection, we know that Omicron, having had a previous dose of one of the other variants of Covid-19, did escape that immune protection from both a previous dose and from only two doses of vaccine,’ Chief Medical Officer Paul Kelly told Sky News.

‘Sub-variants of Omicron BA.4 and BA.5 have now become the dominant strain in the UK (and are) growing…

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