What is the difference between Salmonella Typhi and Paratyphi?

Paratyphoid has a shorter incubation period but is clinically similar to typhoid. In the literature, paratyphoid is considered to be typically milder than typhoid and of shorter duration [3, 7] but it can on occasion be equally as severe as typhoid [10].

What does Salmonella Paratyphi cause?

Salmonella Typhi and Salmonella Paratyphi A, collectively known as typhoidal Salmonella, are causal agents for a serious, invasive (bacteraemic), sometimes fatal disease of humans called typhoid fever or paratyphoid fever (also called enteric fevers).

What is S Paratyphi C?

Paratyphoid is caused by the bacterium Salmonella enterica of the serotypes Paratyphi A, Paratyphi B, or Paratyphi C growing in the intestines and blood. They are usually spread by eating or drinking food or water contaminated with the feces of an infected person.

What is Salmonella Paratyphi B?

Salmonella is a Gram-negative bacterium, a cylindrical rod of size about 2 microns by 0.5 microns. Salmonella Paratyphi B causes enteric fever in humans; the disease closely resembles typhoid fever, which is caused by the related serovar Salmonella Typhi.

What does S typhi O 1 40 mean?

Typhoid patients with titres greater than or equal to 1:40 for O and H antigens of Salmonella typhi were significantly different (P less than 0.01) from those with non-typhoid fever. The O agglutinin was highly specific (100%) in the diagnosis of the disease.

What is ah in Widal test?

The antigens used in the test are “H” and “O” antigens of Salmonella Typhi and “H” antigen of S. Paratyphi. The paratyphoid “O” antigen are not employed as they cross react with typhoid “O” antigen due to the sharing of factor 12. “O” antigen is a somatic antigen and “H” antigen is flagellar antigen.

What is the meaning of S typhi D?

Typhoid is an infection caused by the bacterium Salmonella typhimurium (S. typhi). The bacterium lives in the intestines and bloodstream of humans. It spreads between individuals by direct contact with the feces of an infected person. No animals carry this disease, so transmission is always human to human.

What is O antigen and H antigen in S typhi?

The bacteria’s surface are covered with lipopolysaccharide (LPS). The outermost portion of the LPS is the O antigen. Flagella are whip-like tails that bacteria use to move around. Flagella is the whole structure, while the slender threadlike portion of the flagella is called the H antigen.