Many pathogenic bacteria exist in nature as multiple antigenic types or serotypes, meaning that they are variant strains of the same pathogenic species. For example, there are multiple serotypes of Salmonella typhimurium based on differences in cell wall (O) antigens or flagellar (H) antigens.any pathogenic bacteria exist in nature as multiple antigenic types or serotypes, meaning that they are variant strains of the same pathogenic species. For example, there are multiple serotypes of Salmonella typhimurium based on differences in cell wall (O) antigens or flagellar (H) antigens.
There is no word in French for the neuter pronoun it because French grammar knows only masculine and feminine gender. Use the masculine or feminine pronoun, il or elle, resp â¦ ectively, depending upon the gender of the antecedent. Where the gender of the antecedent is not specified, use the masculine form il.Neither. Only the nouns-and their related adjectives-are masculine and feminine in French.se the masculine or feminine pronoun, il or elle, resp â¦ ectively, depending upon the gender of the antecedent. Where the gender of the antecedent is not specified, use the masculine form il. Neither.
Usage notes[edit] The feminine noun ama is like other feminine nouns starting with a stressed a sound in that it takes the definite article el (normally reserved for masculine nouns) in the singular when there is no intervening adjective: