Explorative study on Lactobacillus species and their acid-producing capacity and anti-microbial activity in head and neck cancer patients.

The most frequent species isolated from head and neck cancer patients both pretreatment and post treatment were L. paracasei, L. casei/rhamnosus, and L. fermentum. L. paracasei showed the best acid-producing capacity and the highest proportion with anti-microbial activity against S. mutans.