If vaccinated persons have COVID symptoms, after getting the shot (no matter when happening), they should be tested while not ignoring as a vaccine side effect. If they become negative in the nasal swabs, in clinical trials they are termed as COVID suspected but not confirmed.
Within 7 days after taking any shot, the vaccinated group, in the Pfizer-BioNTech clinical trial, had a higher number of suspected but not confirmed cases compared to the placebo group. Therefore, I believe any such symptomatic case should be further recommended for stool tests.
If their nasal swab tested negative, they still may shed virus from shared toilets or in the same household. If you look at kid's hospitalization, you notice that this is all-time high since the pandemic began even though cases were at peak in January. covid.cdc.gov/covid-data-tra… 
Especially in HHS regions 4 and 6 (predominantly in the south), kids' hospitalization during summer is higher than rest of the country. It indicates that kids are getting sick from the transmitted viruses because of virus favorable indoor in the south.
https://twitter.com/mahmudme01/status/1429206467689820162
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