How many people in the world have pneumonia?

As of my limited knowledge up to April 2023, the World Health Organization (WHO) estimated that there were approximately 740,000 deaths due to pneumonia in children under five years of age in 2019, making it the single largest infectious cause of death among young children worldwide.

However, it's important to note that this number may have changed since then due to ongoing trends and factors such as the COVID-19 pandemic, which has affected respiratory health worldwide.

For the most up-to-date and accurate information on the prevalence of pneumonia, I recommend checking the WHO's official website or consulting reputable sources that track global health statistics.