Health authorities are scrambling to contain the infection detected yesterday after reporting 60 close contacts.

A security guard working for one of Perth’s quarantine hotels was on Sunday confirmed to have contracted COVID-19.

It is suspected he has caught one of the more infectious strains, likely the UK variant, with concerns he passed it onto his three roommates.

The man, in his 20s, is also a ride sharing driver.

Mark McGowan and his Government revealed a long list of exposure sites yesterday, asking the public to get tested if they had attended any venues listed.

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WA Police Commissioner Chris Dawson confirmed 60 close contacts had been detected who were all self-isolating.

“The next couple of days are going to be quite critical because there’s been 60 identified contacts from this one individual,” Mr Dawson said on 6PR.

“We call him case 903. This is a person who … we suspect has got the UK variant strain but that will be confirmed in the next 36 hours.

“If he has that more transmissible (variant) then that’s what’s causing us the concern.”

Today is WA’s first day of its five-day lockdown, with enormous lines spotted outside testing clinics across Perth.

Masks must be worn until Friday while outside, with people caught breaching the direction liable for a $1,000 on the spot fine, or up to $50,000.

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Exemptions include children under 12, people with mental or physical illnesses or disabilities, people engaging in teaching, swimming, eating or drinking.

A mask also does not need to be worn if you’re swimming or are the sole person in your car.

Stay up to date with the latest Perth news on SoPerth.com.au.