Which type of infection does not belong to nosocomial infection?
A. The doctors acquire the pathogens from their patients when he examine the patient.
B. The pathogens invade the wound of a worker when he participated inconstruction of a new hospital.
C. The patient's infection was caused by not sterilized surgical scalpels .
D. The newly born baby get infection during delivery.
Which statement is right about endotoxin?
A. It is inactivated by 56℃within 30min,
B. Toxoid can be made from endotoxin,
C. They are LPS produced by G- bacteria,
D. They are best antigens.
Which statement about comparison between exotoxins and endotoxins is not correct ?
A. They are less toxicthan exotoxins
B. They are more stable on heating than exotoxins
C. They bind to specific cell receptors，whereas exotoxins do not
D. They are part of the bacterial cell wall，whereas exotoxins are not.
Which one of the following statements about exotoxins is not correct ?
A. When treated chemically，some exotoxins lose their toxicity to become toxoid.
B. Some exotoxins are capable of causing disease in purified form，free of any bacteria
C. Some exotoxins act in the gastrointestinal tract to cause diarrhea
D. Some exotoxins contain lipopolysaccharides as the toxic component
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