Bird flu, influenza and 1918: the case for mutant Avian tuberculosis

Medical Hypotheses
|June 30, 2006
PubMed

Insights

The 1918 influenza pandemic may have been caused by tuberculosis, not a virus. This challenges current understanding and highlights the need for accurate diagnosis to prevent ineffective treatments for respiratory illnesses.

Area of Science:

  • Epidemiology
  • Virology
  • Microbiology

Background:

  • The 1918 influenza pandemic's high mortality rate remains debated.
  • Traditional influenza (flu) is not typically fatal, raising questions about the 1918 event.
  • Bird flu (H5N1) and the 1918 pandemic are often compared, but knowledge gaps exist.

Discussion:

  • Undetected tuberculosis may have been the primary cause of death during the 1918 flu epidemic.
  • The virulence and unusual age distribution of deaths in 1918 are not explained by viral theories alone.
  • Avian and human tuberculosis, potentially combined in pigs, could explain the 1918 pandemic's lethality.

Key Insights:

  • Mistaking mycobacterial disease for influenza A could lead to disastrous public health outcomes.
  • Accurate diagnosis is crucial for effective treatment and stockpiling of medical resources.
  • Re-evaluating the role of tuberculosis in historical respiratory pandemics is warranted.

Outlook:

  • Further investigation into the etiology of the 1918 pandemic is urgently needed.
  • Differential diagnosis for acute respiratory failure should include mycobacterial infections.
  • Understanding historical pandemics can inform current public health strategies against novel respiratory diseases.

Related Concept Videos

Viral Mutations00:36

Viral Mutations

A mutation is a change in the sequence of bases of DNA or RNA in a genome. Some mutations occur during replication of the genome due to errors made by the polymerase enzymes that replicate DNA or RNA. Unlike DNA polymerase, RNA polymerase is prone to errors because it is not capable of “proofreading” its work. Viruses with RNA-based genomes, like HIV, therefore accrue mutations faster than viruses with DNA-based genomes. Because mutation and recombination provide the raw material for adaptive...
Viral Recombination00:57

Viral Recombination

Cells are sometimes infected by more than one virus at once. When two viruses disassemble to expose their genomes for replication in the same cell, similar regions of their genomes can pair together and exchange sequences in a process called recombination. Alternatively, viruses with segmented genomes can swap segments in a process called reassortment.
Influenza01:27

Influenza

Influenza is an acute, highly communicable viral disease that affects the respiratory tract and is responsible for seasonal epidemics worldwide. Influenza A is the most prevalent type associated with widespread outbreaks and is subtyped based on two surface glycoproteins: hemagglutinin (H) and neuraminidase (N), as in H1N1. These glycoproteins are essential for viral infectivity, transmission, and immune recognition. Transmission occurs primarily through respiratory droplets and contaminated...
Tuberculosis01:23

Tuberculosis

Tuberculosis (TB) remains a significant global health concern, primarily targeting the lungs and spreading through airborne transmission. Infection begins when aerosolized droplet nuclei, expelled by an individual with active TB, are inhaled by another person. These microscopic particles carry Mycobacterium tuberculosis, the causative agent of TB. Upon reaching the alveoli, the bacilli are engulfed by alveolar macrophages. However, due to their specialized lipid-rich cell wall, these pathogens...
Leaky Scanning02:28

Leaky Scanning

During most eukaryotic translation processes, the small 40S ribosome subunit scans an mRNA from its 5' end until it encounters the first start AUG codon. The large 60S ribosomal subunit then joins the smaller one to initiate protein synthesis. The location of the translation initiation is largely determined by the nucleotides near the start codon as there may be multiple translation initiation sites present on the mRNA.  Marilyn Kozak discovered that the sequence RCCAUGG (where R stands for...
Vaccinations01:51

Vaccinations

Overview