Ms Ferrier took the train home to Glasgow from London in September 2020 after being told she had tested positive for Covid.
She spoke in Parliament while awaiting the results of her test.
The MP took the test on Saturday 26 September because she had a “tickly throat”.
Ms Ferrier admitted that she had culpably and recklessly exposed the public to the virus ahead of a trial at Glasgow Sheriff Court.
The MP, who was previously elected as an SNP MP, lost the whip and currently sits as an independent.
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