Influenza and Bacterial Pathogen Coinfections in the 20th Century

Table 1

Characteristics of studies included in analysis (𝑛=71).

Characteristics	Studies (𝑛)	%
Study type
Descriptive	65	91.5
Analytic	2	2.8
Interventional	4	5.6
Study scope
Laboratory-based	1	1.4
Population-based	15	21.1
Hospital-based	55	77.5
Influenza diagnostic methods
Clinical diagnosis	32	45.1
Antigen/antibody detection	16	22.5
RT-PCR	1	1.4
Culture	22	31.0
Bacterial infection diagnostic methods
Clinical diagnosis	3	4.2
Antigen/antibody detection	2	2.8
Culture	66	93.0

Note: RT-PCR, reverse transcription-polymerase chain reaction.