Legionnaires' disease showed that Legionnaires' disease was responsible and the immediate epidemiological investigation traced the source of the infection to the air-conditioning cooling tower on the roof of Stafford District Hospital. In March 1999, a large outbreak in the Netherlands occurred during the Westfriese Flora flower exhibition in Bovenkarspel; 318 people became ill and at least 32 people died. This was the second-deadliest outbreak since the 1976 outbreak and possibly the deadliest, as several people were buried before Legionnaires' disease had been diagnosed. The world's largest outbreak of Legionnaires' disease happened in July 2001 with people appearing at the hospital on July
Hospital-acquired pneumonia hospitals and critical care units' Common bacterial pathogens include aerobic GNB, such as "Pseudomonas aeruginosa", "Acinetobacter baumanii", "Klebsiella pneumoniae", "Escherichia coli" as well as gram-positive organisms such as "Staphylococcus aureus". In patients with an early onset pneumonia (within 5 days of hospitalization), they are usually due to anti microbial-sensitive bacteria such as "Enterobacter" spp, "E. coli", "Klebsiella" spp, "Proteus" spp, "Serratia mare scans", community pathogens such as "Streptococcus pneumoniae, Haemophilus influenzae", and methicillin-sensitive "S. aureus" should also be considered. Pneumonia that starts in the hospital tends to be more serious than other lung infections because: people in the hospital are