Table 2. Indirect immunofluorescence results and interval between the dates the first and second samples were taken, for convalescent paired samples from 37 confirmed cases, Spain, 2008–14.

Indirect immunofluorescence results		Number of samples	Mean time in days^a (range) between the dates the first and second samples were taken, post symptom onset
First sample	Second sample	Number of samples
IgM
Pos	Pos	17	43 (7–79)
Neg	Pos	4	22.5 (16–29)
Neg	Neg	4	117 (53–181
IgG
Pos	Pos	17	108 (6–210)
Neg	Pos	15	38 (16–60)
Pos	Neg	1	58^b (NA)

NA: not applicable; Neg: negative; Pos: positive.

^a Unless otherwise specified.

^b The second sample was taken 58 days after symptom onset. The date the first sample was taken was not available.