A decade of norovirus disease risk among older adults in upper-middle and high income countries: a systematic review

Table 2 Attack, case hospitalization and case fatality rates during norovirus -associated outbreaks in long-term care facilities

Author (Ref)	Location	Number of norovirus (NoV) outbreaks	Population included in estimates	NoV-associated outcome^a
Author (Ref)	Location	Number of norovirus (NoV) outbreaks	Population included in estimates	Attack rate (%)	Case hospitalization rate (%)	Case fatality rate (%)
Davis [88]	Queensland, Australia	264	Residents and staff	20.3 any NoV-associated illness	1.7	0.5
Kirk [83]	Nationwide, Australia	1136	Residents and staff	--	--	0.3
Rosenthal [38]^b	Oregon, US	163	Residents	4; All facilities	3.1; All facilities	0.5; All facilities
				6; Nursing facilities	1.8; Nursing facilities	0.5; Nursing facilities
				3; Non-nursing facilities	4.3; Non-nursing facilities	0.4; Non-nursing facilities
Friesma [87]^c	5–6 local health services, NL	28	Residents	Nursing homes	0.5	1.6
				15.5 GII.4
				12.8 Non-GII.4
				Individual wards of nursing homes
				40.0 GII.4
				31.1 Non-GII.4
Greig [85]	Global review	43	Residents	--	4.2	0.7
Utsumi [86]^d	Global review	23	Residents	45 Residents	6	--
Utsumi [86]^d	Global review	23	Staff	42 Staff	6	--

^aDefinition of Nov-associated outcome may have differed across individual studies
^bRosenthal et al. [38] defined nursing facility as those institutions providing 24-h nursing care and non-nursing facility otherwise; average attack rates reported
^cFriesma et al. [87] report NoV outbreaks in both residents and staff but results reported for residents only; median attack rates reported
^dUtsumi et al. [86] report median attack rates

ISSN: 1471-2334