Spanish Flu (1918-1920): Summary and Key Points

Overview of the Spanish Flu (1918-1920)

• Definition of Terms:

  • Epidemic: Rapid spread of a virus or disease within a community or region.

  • Pandemic: Widespread outbreak affecting multiple countries or continents.

Spanish Flu Pandemic

• Characteristics:

  • New strain of influenza (H1N1) that spread globally from 1918 to 1919.

  • Estimated 500 million infected worldwide (1/3 of global population).

  • Caused approximately 50 million deaths, more deadly than WWI.

Origin of the Name "Spanish Flu"

• Named due to Spain's lack of wartime censorship, being the first to report the outbreak in the media.

Symptoms of Spanish Flu

• Common Symptoms:

  • Sore throat

  • Running nose

  • Muscle aches

  • Dry cough

  • Headache

  • Fatigue

  • Fever

• Severe Symptoms:

  • Cardiogenic pulmonary edema

  • Cyanosis (blue skin discoloration)

  • Shortness of breath

  • Pulmonary edema

  • Internal bleeding

Factors for Rapid Spread and High Mortality

• Poor sanitation and crowded conditions from wartime led to ideal conditions for virus spread.

• Limited healthcare response due to wartime conditions causing shortages in medical personnel and knowledge.

• Route of Transmission: Airborne via coughing, sneezing, or breathing by infected individuals, especially affecting the lungs.

• Immune Factors: Lack of human immunity towards the new strain of H1N1 allowed rapid infection.

Waves of the Spanish Flu

• First Wave (Spring 1918): Mild illness, easy recovery.

• Second Wave (Fall 1918): Most severe, highest death rates in October 1918.

• Third Wave (Winter 1919-1920): Continued spread with lower impact, leading to 675,000 deaths in the U.S. during this time.