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The process of converting very light nuclei into heavier nuclei is also accompanied by the conversion of mass into large amounts of energy, a process called fusion. The principal source of energy in the sun is a net fusion reaction in which four hydrogen nuclei fuse and ultimately produce one helium nucleus and two positrons.
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Plants obtain inorganic minerals and water from the soil, which acts as a natural medium for land plants. The composition and quality of soil depend not only on the chemical constituents but also on the presence of living organisms. In general, soils contain three major components:
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40 Years without Smallpox.

G A Shchelkunova1, S N Shchelkunov1,2

  • 1State Research Center of Virology and Biotechnology VECTOR, Koltsovo, Novosibirsk region, 630559 , Russia.

Acta Naturae
|January 18, 2018
PubMed
Summary

Global smallpox eradication efforts led to waning immunity in populations, increasing susceptibility to zoonotic orthopoxviruses. This highlights the ongoing threat of smallpox reemergence and the need for new diagnostic and therapeutic strategies.

Keywords:
DNA diagnosticschemotherapeutic drugsevolutionsmallpoxvaccinevariola (smallpox) virus

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Area of Science:

  • Virology
  • Epidemiology
  • Public Health

Background:

  • The last natural smallpox case was in 1977, following the World Health Organization's global eradication program.
  • Widespread cessation of smallpox vaccination has led to diminished population immunity over 40 years.
  • Decreased immunity increases vulnerability to other zoonotic orthopoxvirus infections.

Purpose of the Study:

  • To address the potential threat of smallpox reemergence due to evolving zoonotic orthopoxviruses.
  • To highlight the need for updated strategies in managing orthopoxvirus infections in humans.
  • To emphasize the development of modern diagnostic, preventive, and therapeutic approaches.

Main Methods:

  • Review of historical data on smallpox eradication and vaccination policies.
  • Analysis of recent outbreaks of zoonotic orthopoxvirus infections globally.
  • Assessment of current trends in viral evolution and epidemiology.

Main Results:

  • Human populations have lost immunity to smallpox and related zoonotic orthopoxviruses.
  • Multiple orthopoxvirus outbreaks have occurred across continents in recent decades.
  • A significant risk of smallpox reemergence exists due to viral adaptation.

Conclusions:

  • The decline in herd immunity poses a risk for orthopoxvirus resurgence.
  • Continuous monitoring and development of countermeasures are crucial.
  • Modern diagnostics, vaccines, and therapeutics are essential for future control efforts.