<P> Salmonella species are intracellular pathogens : certain serotypes cause illness . Nontyphoidal serotypes can be transferred from animal - to - human and from human - to - human . They usually invade only the gastrointestinal tract and cause Salmonella food poisoning ; symptoms resolve without antibiotics . However , in sub-Saharan Africa they can be invasive and cause paratyphoid fever , which requires immediate treatment with antibiotics . Typhoidal serotypes can only be transferred from human - to - human , and can cause Salmonella food poisoning , typhoid fever and paratyphoid fever . Typhoid fever occurs when Salmonella invades the bloodstream -- the typhoidal form ; or in addition spreads throughout the body , invades organs , and secretes endotoxins -- the septic form . This can lead to life - threatening hypovolemic shock and septic shock and requires intensive care including antibiotics . </P>
<P> Salmonella species are intracellular pathogens : certain serotypes cause illness . Nontyphoidal serotypes can be transferred from animal - to - human and from human - to - human . They usually invade only the gastrointestinal tract and cause Salmonella food poisoning ; symptoms resolve without antibiotics . However , in sub-Saharan Africa they can be invasive and cause paratyphoid fever , which requires immediate treatment with antibiotics . Typhoidal serotypes can only be transferred from human - to - human , and can cause Salmonella food poisoning , typhoid fever and paratyphoid fever . Typhoid fever occurs when Salmonella invades the bloodstream -- the typhoidal form ; or in addition spreads throughout the body , invades organs , and secretes endotoxins -- the septic form . This can lead to life - threatening hypovolemic shock and septic shock and requires intensive care including antibiotics . </P>
salmonella spp . typically transmitted from animals to humans
salmonella spp . typically transmitted from animals to humans
Nontyphoidal serotypes
Nontyphoidal serotypes