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The beneficial effect of chitin-based treatments to antagonistic bacteria is not restricted to B. subtilis, with both chitin and chitosan improving the control of Fusarium wilt in both tomato [66] and cucumber [67] when applied to the soil with a range of different species of chitinolytic microbes.
Confusingly, certain bacteria can be beneficial to some animals, and pathogenic to others. More commonly, pathogenic bacteria are harmful only to a limited number of hosts, or even only to one, whereas they live happily within other hosts without causing trouble.oth viruses and bacteria can cause disease. However, not all types of viruses cause disease in humans, and not all bacteria cause disease. The majority of bacteria are harmless and some are beneficial. Another common misconception is that all bacteria are bad for you.