Sporadic disease

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In

infectious disease which occurs only infrequently, haphazardly, irregularly, or occasionally, from time to time in a few isolated places, with no discernible temporal or spatial pattern, as opposed to a recognizable epidemic outbreak or endemic pattern.[1][2][3][4] The cases are so few (single or in a cluster) and separated so widely in time and place that there exists little or no discernable connection within them. They also do not show a recognizable common source of infection.[note 1]

In the discussion of

non-infectious diseases, a sporadic disease is a non-communicable disease (such as cancer) which occurs in people without any family history of that disease or without any inherited genetic predisposition for the disease (change in DNA which increases the risk of having that disease).[5]
Sporadic non-infectious diseases arise not due to any identifiable inherited gene, but because of randomly induced genetic mutations under the influence of environmental factors or of some unknown etiology. Sporadic non-infectious diseases typically occur late in life (late-onset), but early-onset sporadic non-infectious diseases also exist.

Examples

Sporadic infectious diseases

Examples depend on time and place, because an infectious disease that is common in one area may be rare in another.

In the United States, tetanus, rabies, and plague are considered examples of sporadic diseases. Although the tetanus-causing bacteria Clostridium tetani is present in the soil everywhere in the United States, tetanus infections are very rare and occur in scattered locations because most individuals have either received vaccinations or clean wounds appropriately. Similarly the country records a few scattered cases of plague each year, generally contracted from rodent animals in rural areas in the western part of the country.[6]

In another example,

autochthonous cases (i.e. between two individuals in the same place) are too few and scattered to have any appreciable effect on the community.[7]

Sporadic non-infectious diseases

Some examples of sporadic non-infectious diseases are

sporadic porphyria cutanea tarda
.

Potential source for an epidemic

If the conditions are favorable for its spread (

immune individuals, etc.), a sporadic infectious disease may become the starting point of an epidemic
.

For example, in

Contaminated school meals were identified as the major source of infection, and after several years, the infection rate declined significantly.[8]

In another example, the South Asian country of Bangladesh experienced sporadic cases of

rainwater) for the vector, and very little public awareness gave rise to a sudden epidemic of dengue, with 5,551 reported cases that year.[9] The type 3 Dengue virus subsided after 2002 and re-emerged in 2017, once again causing an outbreak in 2019.[10]


Difficulty of measuring

endemic disease (from a traditional population-based epidemiology approach) actually consists of multiple small outbreaks (from a molecular epidemiology approach) in which seemingly unrelated (i.e., sporadic cases) are in reality epidemiologically related, because they belong to the same genotype of an infectious agent. Riley considers the differentiation of a disease occurrence as either endemic or epidemic to be not really meaningful. According to Riley, since most so-called sporadic occurrences of an endemic disease are actually small epidemics, rapid public health interventions against such occurrences can be made in the same way as they are done for recognized acute epidemics (i.e. epidemic in the traditional sense).[11]

Notes and references

Notes

  1. ^ According to Fullerton et al. 2012, pp. 281–292: "...sporadic cases do not necessarily share a single specific common contaminated source..."

References

  1. ^ Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health (7th ed.), Saunders, 2003
  2. ^ Principles of Epidemiology in Public Health Practice (3rd ed.), U.S. Department of Health and Human Services and Centers for Disease Control and Prevention (CDC), 2006, p. 72
  3. ^ Miquel Porta; John M. Last, eds. (2018), A Dictionary of Public Health (2nd ed.), Oxford University Press
  4. ^ Miquel Porta, ed. (2016), A Dictionary of Epidemiology (6th ed.), Oxford University Press, pp. 46–47
  5. ^ "Definition of sporadic cancer". cancer.gov. National Cancer Institute. Retrieved 25 March 2024.
  6. ^ "Disease and Epidemiology", Microbiology by OpenStax, XanEdu Publishing Inc, 2016, p. 699
  7. ^ WHO Malaria Terminology, World Health Organization, 2019, p. 30
  8. S2CID 214772371
  9. ^ a b Sifat Sharmin, Elvina Viennet, Kathryn Glass and David Harley (September 2015), "The emergence of dengue in Bangladesh: Epidemiology, challenges and future disease risk", Transactions of the Royal Society of Tropical Medicine and Hygiene{{citation}}: CS1 maint: multiple names: authors list (link)
  10. S2CID 209333186
  11. ^ Lee W Riley (July 2019), "Differentiating Epidemic from Endemic or Sporadic Infectious Disease Occurrence", Microbiology Specrum, 7 (4)

Works cited

  • Fullerton, Kathleen E.; Scallan, Elaine; Kirk, Martyn D.; Mahon, Barbara E.; Angulo, Frederick J.; de Valk, Henriette; van Pelt, Wilfrid; Gauci, Charmaine; Hauri, Anja M.; Majowicz, Shannon; O'Brien, Sarah J. (2012), "Case-Control Studies of Sporadic Enteric Infections: A Review and Discussion of Studies Conducted Internationally from 1990 to 2009", Foodborne Pathogens and Disease, 9 (4): 281–292,
    PMID 22443481
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