Source(s): I am a Meteorologist. Isolated thunderstorms are especially common during the summer in the mid-late afternoon when it is hot and humid. This is when you see those high towering, popcorn looking clouds in the middle of the afternoon when the sun hits the grounds and heats the air up. Usually isolated storms do not cover a large area.
Salmonella enterica serovar Typhimurium (S. typhimurium) causes enteric disease in humans. It is a food-and water-borne pathogen that can be easily disseminated in a population: for instance outbreaks of salmonellosis can occur by contamination of salad.
Salmonella Typhi. 1  Salmonella Typhi can only infect humans. 2  It causes typhoid fever. 3  It is common in developing countries where hygiene is poor and the water can be contaminated with sewage. 4  The symptoms of typhoid fever include fever, weakness, stomach pains, headache or loss of appetite. Salmonella Typhimurium and Salmonella Typhi are closely related. 2  However, there are distinct differences in the type and severity of infectious disease they both cause. 3  This difference in infections is the result of differences in their genetic makeup.