good and bad bacteria

[latin]

Hi would i be right in saying that pathogenic bacteria (i think thats the bad one) secrete acid? What do good bacteria secrete? do they secrete acid aslo? or do they secrete oxygen?

Thanks

[Health Dr. 1]

It is more complicated than whether each type has acidic secretions. The lactobacilli, probably the most well known of the “friendly bacteria,” actually produce lactic acid by converting lactose or some other sugar. Some good bacteria also secrete the oxygen species hydrogen peroxide to counter the growth of competing anaerobic bacteria. Pathogenic, disease-causing, bacteria can produce many different types of toxins depending on the specific bacterium. For example, the bacterium Clostridium botulinum produces botulin toxin, the culprit in botulism.