Etiological studies
Streptococcus pneumoniae etiology of CAP was diagnosed
by significant increases of IgG antibodies to pneumococcal
pneumolysin or C-polysaccharide between
paired sera, using enzyme immunoassay (EIA). Non-capsulated
Haemophilus influenzae and Moraxella catarrhalis
infections were diagnosed by significant increases
of IgG antibodies to whole cell antigens using EIA; all
cases were mixed infections with viruses or other bacteria.
Mycoplasma pneumoniae etiology was diagnosed
by significant increases of antibodies in either complement
fixation (CF) or EIA serology. Correspondingly,
Chlamydia pneumoniae etiology was diagnosed by EIA
and/or by micro immunofluorescence (MIF) [9], and
Simkania negevensis etiology by MIF [10]. Viral involvement
by respiratory syncytial virus (RSV), human