• BY INFLUENZA VIRUS VARIANT H1N1
• 3 WAVES – OVER 2 YEARS – 1918-19
• ACROSS COUNTRIES, SPAIN 1^ST REPORTED IT
• 1^ST CASE IDENTIFIED IN US – MARCH 1918
• OVER 50 CRORE PATIENTS (500 MILLION+)
• THAT IS, 1/3^RD OF THE WORLD’S POPULATION
• MILLIONS KILLED, NO SPECIFIC NUMBER
• VICTIMS – ESTIMATED 5 CRORE+ KILLED – WHO
• 2.7% – FATALITY RATE (OF WORLD’S POPULATION)
• INDIA – AROUND 1.8 CRORE KILLED
• 1^ST WORLD WAR – 1.7 CRORE DEATH TOLL
• 20 TO 40 AGE GROUP – MOST AFFECTED

1^ST WAVE – 1918 SPRING

• MILDER BUT HIGHLY INFECTIOUS

2^ND WAVE – 1918 FALL

• LETHAL, MUTATIONS IN VIRUS
• AUG-SEPT 1918 – SURGE STARTED
• OCT-DEC 2018 – 2/3^RD OF SPANISH FLU DEATHS

3^RD WAVE – 1918 WINTER

• DEC 1918-APRIL 1919
• VARIANTS WERE LESS VIRULENT
• AUSTRALIA TO EUROPE AND US
• KILLED MILLIONS BUT LESS FATAL THAN 2^ND WAVE