Table 2. Relative effectiveness of isolation policies. Median effect (interquartile range).

Outbreak	Policy option	Attack rate		Outbreak duration
		Baseline (%)	% decrease	Baseline (days)	% decrease
Flu	One day isolation (CDC guideline)	25	29 (13–59)%	82	1 (−2 to 16)%
	Two day post-fever isolation		70 (55–85)%		18 (6–66)%
	Four day school week		73 (64–88)%		20 (11–55)%
	Three day school week		93 (91–97)%		99 (82–100)%
COVID-19	One day isolation	11.3	7 (5–14)%	138	1 (1–4)%
	Two day post-fever isolation		10 (5–17)%		1 (1–4)%
	14 day post-fever isolation		14 (5–26)%		4 (3–7)%
	Four day school week		57 (52–64)%		22 (12–26)%
	Three day school week		81 (79–83)%		46 (33–52)%