Eric Walker added a number of topics and a number of links to Gram-negative bacteria, and added Gram-negative bacteria to Bacteria and Gram staining

Eric Walker added 2020-01 University of New South Wales study of whooping cough and a number of links to Bordetella pertussis, and added Bordetella pertussis to Bordetella

Eric Walker added Bordetella pertussis to Bordetella, and added Bordetella to Gram-negative bacteria