"Obviously, I was fine in the end but that obviously was something I hadn't gone through before and then you start playing games in your head like 'do I feel a little..' and 'maybe I do have it and just', but that was a bit of panic one morning."
In order to commence the season in July, F1 placed itself in a bubble with each team operating as its own sub-bubble.
The sport also put in place a rigorous testing regime and has completed over 75,000 tests as up to December 4, with only 89 tests returning positive results.
Ricciardo added: "As the season went on I actually became more and more disciplined with isolating or just taking care of myself, especially after Checo [Perez] got it and I was like 'Okay so this isn't a joke'.
"I was being very careful so I was quite surprised [by the test]. Obviously, in the end I didn't have it but I was scratching my head."
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