This is the 12464th most frequent Russian word.
кишечная
"Intestinal."
The word 'кишечная' here is an adjective derived from 'кишечник' (intestine), describing the type of infection as related to the intestines.
Кишечная инфекция может быть опасной.
Intestinal infection can be dangerous.
In this sentence, 'кишечная' describes the 'flora' as being related to the intestines, indicating the context of beneficial microorganisms in the digestive system.
Врач назначил лекарство для кишечной флоры.
The doctor prescribed medicine for intestinal flora.
The term 'кишечное' (a form of 'кишечная' adjusting for grammatical agreement) describes 'blood circulation,' emphasizing its association with the intestinal system.