MDS PREP
What is the typical finding of eosinophils in amoebic dysentery?
1) Abundant
2) Few
3) Absent
4) Numerous
General Microbiology Answer: 3Amoebic dysentery is not typically associated with a significant eosinophilic response. Eosinophils are a type of white blood cell that is often involved in allergic reactions and parasitic infections, but their presence is usually minimal in the context of amoebic infections. The inflammatory response in amoebic dysentery is mainly composed of neutrophils and macrophages.
What type of vaccine is the 17D vaccine for yellow fever?
1) Live attenuated
2) Inactivated
3) Subunit
4) Toxoid
General Microbiology Answer: 1
The 17D vaccine for yellow fever is a live attenuated vaccine, meaning it contains a weakened form of the virus that can stimulate an immune response without causing the disease. This type of vaccine is effective in providing long-lasting immunity.
Which of the following statements about the fermentation of sugars by Anthracoid bacilli is true?
1) Anthracoid bacilli ferment glucose, maltose, lactose, and sucrose, producing acid and gas.
2). Anthracoid bacilli do not ferment glucose but ferment maltose, lactose, and sucrose.
3) Anthracoid bacilli only ferment glucose.
4) Anthracoid bacilli ferment glucose, maltose, and lactose, but not sucrose.
General Microbiology Answer: 1
Anthracoid bacilli, such as those in the genus Bacillus, are capable of fermenting various sugars, including glucose, maltose, lactose, and sucrose. This fermentation process results in the production of acid and gas, which can be detected by observing changes in the pH of the medium and the formation of gas bubbles. This statement is true as it accurately describes the typical sugar fermentation profile of these bacteria.
Which of the following is considered as a disadvantage in the application of dry heat as a sterilizing agent?
1. Requires excessive time
2. Does not destroy hepatitis viruses
3. Dulls instrument cutting edges
4. All of the above
Microbiology
Answer: 1
Most bacterial endotoxins are composed of
1. pure carbohydrates
2. mucoprotein complexes
3. pure lipids
4. lipoprotein-polysaccharide complexes
Microbiology
Answer: 4
Most bacterial endotoxins are composed of lipoprotein-polysaccharide complexes
The period from disease initiation to disease detection in non-infectious disease is called -
1. Incubation period
2. Serial interval
3. Latent period
4. Lag time
Microbiology
Answer: 3
Incubation period: This term is typically used for
infectious diseases and refers to the time between exposure to the
infectious agent and the onset of symptoms.
Serial interval: This refers to the time between
successive cases in a chain of transmission, specifically in infectious
diseases.
Latent period: This is the time from the initiation of
the disease process (or exposure to a risk factor) until the disease is
detectable or until symptoms appear. In non-infectious diseases, this period
can be significant, as the disease may be developing without any noticeable
symptoms.
Lag time: This term can refer to various delays in
processes but is not specifically defined in the context of disease
initiation and detection.
What is the commonest subtype of Hepatitis B virus in Thailand?
1) Subtype A
2) Subtype B
3) Subtype C
4) Subtype E
General Microbiology Answer: 4
Subtype B is the most common subtype of Hepatitis B virus found in Thailand, linked to increased risks of chronic infection.
What is the typical microscopic finding in amoebic dysentery?
1) Numerous pus cells
2) Abundant Charcot-Leyden crystals
3) Many motile bacteria
4) Abundant pyknotic bodies
The typical microscopic finding in amoebic dysentery includes numerous pus cells and abundant Charcot-Leyden crystals.