In the 1950s and 1960s the BBC regularly aired a black and white cartoon with a voice over poem narrated by Cyril Fletcher (or was it Wilfred Pickles) about the virtues of hand washing and good kitchen hygiene. As a child growing up at that time I had the poem memorized.
The lines I still remember are:
"Eight" exactly Gertie's stretch,
A not too greedy little wretch.
Was taken after school to tea,
For a birthday treat by her auntieee.
Next day dawned, as next day will,
To find poor Gertie proper ill.
She cried out, "Come here quickly Mum,
I've an awful pain inside me tum."
The doctor came and shook his head,
“It's not a chill or sweets,” he said.
"Perhaps the food you've given Gertie,
Was chopped up when your hands were dirty."
Upon this Mum was really hurt,
She said, "In my home there's no dirt."
The doctor said, "In general terms,
On your hands are lots of germs.
The cafe clean as clean can be,
May hide behind its posh exterior,
A cook with methods most inferior
Who licking her fingers passes on
Her germs to your confection
Before preparing food you ought ta,
Wash your hands in hot soapy water.
At high degrees of heat they die,
If merely warm they multiply".
This story was made up, did you guess?
And here's it's message to impress.
HANDS SPREAD GERMS.
ALWAYS WASH THEM BEFORE PREPARING FOOD.
I think there is more in the middle about other possible sources of germs but my memory has let me down.
Hope this helps - let me know if you ever find the whole thing.