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Paper I — 2023 July (Supplementary) (2010 Scheme) — Q13

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Paper I
2023 July (Supplementary) (2010 Scheme) · 40 marks · 120 min

Question

Incubation period.

Q132 marksShort Notes

Answer

The incubation period is the time interval between exposure to an infectious agent (entry of the pathogen into the host) and the appearance of the first clinical signs/symptoms of the disease.

Determinants: influenced by the infecting dose (a larger inoculum generally shortens the incubation period), the organism’s rate of multiplication and virulence, its route of entry and site of primary multiplication/spread to the target organ, and the host’s immune status/response.

Clinical/epidemiological significance:

  • Guides the duration of quarantine/observation for contacts after exposure to an infectious case (e.g., isolation periods, contact-tracing windows).
  • Helps in outbreak investigation, allowing epidemiologists to work backward from case-onset dates to identify the likely time and source of exposure.
  • Informs the timing of post-exposure prophylaxis (e.g., rabies immunoglobulin/vaccine must be given before the incubation period ends and clinical disease begins, since treatment after symptom onset is generally ineffective).
  • Varies widely between diseases — from hours (staphylococcal food poisoning, due to pre-formed toxin) to days-weeks (most acute bacterial/viral infections) to months-years (rabies, HIV, leprosy, some prion diseases) — reflecting differences in pathogenic mechanism (toxin-mediated illness has an inherently short incubation period, while diseases requiring extensive organism multiplication or slow disease processes have longer periods).
  1. 1General Properties of Viruses and Virus Host Interaction

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  14. 14Active immunity.2017 February (2010 Scheme)Short Essay · 5 marks
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  36. 36Adjuvant2019 July (Supplementary) (2010 Scheme)Short Note · 2 marks
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  38. 38Prions2013 September (Supplementary) (2010 Scheme)Short Note · 2 marks
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  43. 43Continuous cell lines2015 February (2010 Scheme)Short Note · 2 marks
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  46. 46Cytopathic effect (CPE)2013 September (Supplementary) (2010 Scheme)Short Note · 2 marks
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  50. 50Primary cell culture2021 May (Supplementary) (2010 Scheme)Short Note · 2 marks
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  53. 53Virus cultivation by cell culture method.2016 October (Supplementary) (2010 Scheme)Short Note · 2 marks
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  63. 63Elusion2020 February (Supplementary) (2010 Scheme)Short Note · 2 marks
  64. 64Pulse polio programme2020 February (Supplementary) (2010 Scheme)Short Note · 2 marks
  65. 65Gamma interferon.2022 October (Supplementary) (2010 Scheme)Short Note · 2 marks
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  70. 70Tissue cell line culture2018 July (Supplementary) (2010 Scheme)Short Note · 2 marks
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  72. 72Morphology of bacteriophage2013 September (Supplementary) (2010 Scheme)Short Note · 2 marks
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