Table 1.

Q fever serology

Q fever tests	Day 8	Day 11	Day 18	Day 50	Day 162	Day 1365
Ph 2 EIA IgG	NR	NR	RE	RE	RE	RE
Ph 2 EIA IgM	RE	RE	RE	RE	EQUIV	NR
Ph 1 IgG IF	<10	<10	10	80	≥1280	320
Ph 2 IgG IF	<10	160	≥1280	≥1280	≥1280	640
Ph 2 IgM IF	40	320	≥1280	≥1280	80	40

EIA, enxyme immunoassay; EQUIV, equivocal; IF, immunofluorescence; NR, not reactive; RE, reactive.