Table 2. Most common diagnostic hypotheses related to patient deaths associated with hemorrhagic fever and/or neuroinvasive disease of unknown etiology in the state of São Paulo from 2009 to 2019.

Initial diagnosis	Number of cases n (%)a
Dengue	1,034 (76)
Leptospirosis	633 (47)
Yellow fever	398 (29)
Rickettsia (Brazilian spotted fever)	382 (28)
Hantavirus	319 (24)
Influenza	212 (16)
Chikungunya	48 (4)
Zika virus	23 (2)

^a Percentages from the 1355 cases included in the dataset. Most cases received more than one differential diagnosis, resulting in the percentages totaling more than 100%.