Table 2.
Giardiasis outbreaks due to person-to-person transmission
| Location | Reference | Year | No. of cases or samples (Lab-confirmed) | Household GI illness | Day-care attendance | Young children |
|---|---|---|---|---|---|---|
| Canada | Keystone et al. (1978) | 1976–1977 | 116 (116) | × | × | |
| New Zealand | Wilson et al. (2008) | 2006 | 1214 (1214) | × | ||
| New Zealand | Hoque et al. (2001) | 1998–1999 | 183 (183) | × | ||
| UK | Waldram et al. (2017) | 2014–2015 | 143 (132) | × | × | |
| UK | Ang (2000) | 1999 | 11 (10), 3 asymptomatic | × | × | |
| UK | Rauch et al. (1990) | 1986–1987 | 27 (27), also asymptomatic outbreaks within the same population | × | ||
| USA | Polis et al. (1986) | 1982 | 39 (39) | × | × | |
| USA | Bartlett et al. (1985) | 1982–1983 | 187 (187), 105 asymptomatic | × | × | |
| USA | Black et al. (1977) | 1975 | 38 (38) | × | × | |
| USA | Katz et al. (2006) | 2003 | 149 (97), 105 via person-to-person | × | ||
| USA | Reses et al. (2018) | 2003–2004 | 80 (80) | × | ||
| USA | White et al. (1989) | 1986 | 88 (72) | × |
Abbreviation: GI, gastrointestinal.