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Maybe, though I was completely virus and bug free between March and September, and then from September onwards, my daughter started reception year, and my son started nursery.
I had the same thing when my daughter started nursery, every other week she would be snotty and sneezing. Can't avoid wiping your kids noses, or them sneezing right in your face.
In terms of eating/volume, I was doing about 6-7h of structured training, about 1.5h of strength training, and running on roughly 600-700kcal deficit, so not crash dieting, or over training.
I wonder if there is causation between losing 8kg, training hard and then getting sick a lot...