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The first influenza pandemic of the 18th century begins in 1733. [13]: 18 [14]: 28 [15]: 25 19th century: Two influenza pandemics are recorded in the century. [12] Avian influenza is recorded for the first time. [16] 20th century: Influenza pandemics are recorded four times, starting with the deadly Spanish flu.
Despite the high morbidity and mortality rates that resulted from the epidemic, the Spanish flu began to fade from public awareness over the decades until the arrival of news about bird flu and other pandemics in the 1990s and 2000s. [320] [321] This has led some historians to label the Spanish flu a "forgotten pandemic". [177]
The 1918 flu pandemic, commonly referred to as the Spanish flu, was a category 5 influenza pandemic caused by an unusually severe and deadly Influenza A virus strain of subtype H1N1. The difference between the influenza mortality age-distributions of the 1918 epidemic and normal epidemics.
San Francisco received national praise for its early, proactive response to the Spanish flu pandemic in the fall of 1918. As another pandemic grips the city a century later, San Francisco's past ...
A balloon filled with gaseous hydrogen exploding.. A gas explosion is the ignition of a mixture of air and flammable gas, typically from a gas leak. [1] In household accidents, the principal explosive gases are those used for heating or cooking purposes such as natural gas, methane, propane, butane.
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It is also thought the leak came from an underground pipe that ran from propane tanks to the propane/air mixers, which convert the liquid propane into gaseous form, so that it is in a form usable by the boilers. [7] This is backed up by the discovery of a small pocket of gas trapped below asphalt directly below the Annex building. [8]