Tetanus spores survive in soil (reservoir) and a person acquires infection directly from soil (source). So, soil acts as reservoir as well as source. o Source & reservoir different --> In typhoid, bacillus survives and multiplies inside human cases or carriers (act as reservoir), but immediate source of infection is feces or urine of patients, or contaminated food, water or milk (act as source). o So, source may or may not be a pa of reservoir. In other words reservoir may or may not act as a source. In simple words : ? o Man acquires infection from source. o Infectious agent metabolizes and replicates in reservoir">