B:-H antibody titre more than 1/100 and O antibody titre more than 1/200 is
significant

C:-A rise in antibody titre due to unrelated infections like Malaria, Dengue is
termed as Anamestic response.

D:-False negative widal test is common in early stage of disease.
Correct Answer:- Option-B

Question72:-Which statement is false regarding pathogenesis of Shigellosis?
A:-Minimum infective dose 10-1000 bacilli
B:-Shigella produces endotoxin as well as exotoxins

C:-It enters intestinal mucosa through M cells and are engulfed by
macrophages which release the bacilli resulting in acute colitis

D:-Invasion is determined by a large virulence plasmid which codes for
important virulence factors such as ipa proteins and type 3 secretion systems.

Correct Answer:- Option-A
Question73:-All are true regarding Leprosy except
A:-Leionine facies appearance is typically seen in Tuberculoid leprosy
B:-Multibacillary disease observed in Lepromatous leprosy
C:-Pronounced nerve damages may lead to deformities in Tuberculoid leprosy
D:-Cell mediate immunity is adequate in Tuberculoid leprosy
Correct Answer:- Option-A
Question74:-All are true regarding MRSA except,
A:-Cefoxitin disc is used as a surrogate, marker for identification

B:-Common resistance mechanisms include Beta-lactamase mediated
resistance and alteration at the target Pencillin binding site PBP2a which is
regulated by

C:-All generations of Cephalosporins should be avoided including 5%
generation

D:-MRSA prevalence in India is almost 30-40%
Correct Answer:- Option-C
Question75:-Choose the Invitro tests available for the diagnosis of Diphtheria.
A:-Detection of TOX gene by PCR
B:-Elek's Gel Precipitation test
C:-Detection of Diphtheria toxin by ELISA
D:-All of the above
Correct Answer:- Option-D
Question76:-Which of the following Atypical mycobacteria produce Buruli ulcer
A:-Mycobacterium ulcerans
B:-Mycobacterium scrofulaceum