👉 The Sydney Flu, also known as the 1918–1919 influenza pandemic, was a global health crisis caused by an H1N1 influenza A virus strain. Originating in Australia, this pandemic spread rapidly worldwide, resulting in an estimated 50 million deaths, making it one of the deadliest in human history. The virus exhibited unusual characteristics, including a high mortality rate among young adults, unlike typical influenza patterns where older individuals are more affected. This atypical presentation led to its nickname, as it seemed to "sweep through" populations like a fluid. The Sydney Flu highlighted the unpredictable nature of viral pandemics and underscored the importance of global health surveillance and preparedness.
