Final answer:
Antisera are used to distinguish between different strains within a species of bacteria. Serovars, or serotypes, are classifications of strains based on antigenic differences in the bacterial cell wall. Identifying serovars helps determine the virulence level of bacteria and aids in understanding disease severity.b) Strains
Step-by-step explanation:
Antisera are used to distinguish between different strains within a species of bacteria. Serovars, also known as serotypes, are classifications of strains based on antigenic differences in group-specific polysaccharides located in the bacterial cell wall. By using antisera, scientists can identify the serovars present in a disease outbreak and determine their virulence level. This information is crucial for understanding disease severity and developing appropriate treatments.