From Game 502 on MCIOS, courtesy of Rosie, yours truly, Stevie, Chalky and penelope
This line has been disinfected
And with Pfizer’s best twice injected
So roll up your sleeve
But don't be naive
Immunity's merely suspected.

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I have just discovered, via J Budziszewski's blog, that Thomas Aquinas wrote a near-limerick. It goes like this:

Sit vitiorum meorum evacuatio,
Concupiscentiae et libidinis exterminatio,
Caritatis et patientiae,
Humilitatis et obedientiae,
Omniumque virtutum augmentatio.

The scansion requires the vigorous use of a shoehorn with both hands, but the rhyming is good. It translates as:

May [the sacrifice] purify me from sin,
do away with my evil desires and passions,
bring me charity and patience,
humility and obedience,
and strengthen me in all virtue.