Table 4. Clinical characteristics in patients with naïve and breakthrough measles infection in the Gothenburg area, Sweden, December 2017–January 2018 (n = 28).

Clinical features	Naïve infection (n = 12)			Breakthrough infection (n = 16)			p value^a
Clinical features	n	%	95% CI	n	%	95% CI	p value^a
Fever	12	100	70–100	15	94	68–100	1
Cough	12	100	70–100	4	25	8–53	< 0.0001
Conjunctivitis	5	42	17–71	4	25	8–53	0.4
Coryza	2	17	3–49	1	6	0.3–32	0.6
Sore throat	4	33	11–65	2	13	2–40	0.4
Muscle pain	2	17	3–49	2	13	2–40	1
Itch	1	11	0.4–40	5	31	12–59	0.2

CI: confidence interval.

^a Fisher’s exact test.