The most common bacterial infection varies according to where it is located on the body. As such, the most common bacterial skin infections are usually caused by staphylococcus or streptococcus strains of bacteria. The most common strains for bacterial foodborne infections include salmonella, campylobacter, clostridium perfringens, norovirus, and staphylococcus aureus. Likewise, the most common bacterial lung infections include streptococcus pneumoniae, Haemophilus strains, Staphylococcus aureus, and Mycobacterium tuberculosis.