Table 3.
Decrease in hospitalization rates following the implementation of varicella vaccination.
| Country [Reference] | Data source | Year introduced | Doses compared | Years compared | Change |
|---|---|---|---|---|---|
| Germany [69] | National hospital discharge data | 2004 (1 dose) 2006 (2 doses) |
0 vs. 2 | 2005–12 vs. 1995–2003 | 1.9 vs. 3.3/100,000 |
| Germany; Munich [60] | Annual parent surveys. Monthly pediatric practice surveillance, pediatric hospital databases | 2004 | 0 vs. 1 | 2009 vs. 2005 | 4.3 vs. 7.6/100,000 (↓43%) |
| Germany; Bavaria [124] | Pediatric hospital discharge data | 2004 | 0 vs. 1 | 2011 vs. 2005 | ↓60% |
| Italy [61] | Regional surveillance | 2005 | 0 vs. 1 | 2007–8 vs. 2000 | ↓53% |
| Italy; Tuscany [38] | Regionally notified varicella cases | 2008 | 0 vs. 1 | 2009–12 vs. 2004–7 | 2.2 vs. 4.1/100,000 |
| Italy; Sicily [57] | National Surveillance System | 2003 | 0 vs. 2 | 2012 vs. 2003 | 0.8 vs. 4.8/100,000 |
| Italy [72] | Aggregate regional data | 2003–13 | 0 vs. 2 | 2012 vs. 2004 | ↓75% |
| Spain; Navarre [37] | Regional surveillance data | 2007 | 0 vs. 2 | 2012 vs. 2006 | ↓89% |
| Spain [70] | Hospital discharge data | 2006 (2 doses) | 0 vs. 2 | 2010 vs. 2005 | 37 vs. 47/100,000 (Children < 5 years) |
| Israel; Tel-Aviv [125] | Retrospective hospital chart review | 2008 | 0 vs. 2 | 2009–12 vs. 2004–8 | ↓63% (↓75% in 1–6 years) |
| Canada [73] | Hospital discharge database | 2000–6 (1 dose) 2010 (2 doses) |
0 vs. 1 | 2010 vs. 1990 | >70%↓ (All ages less than 40) |
| Australia; Victoria [66] | Medical consulting data | 2005 | 0 vs. 1 | 2007 vs. 2000 | ↓23% (Annual 7% reduction) |
| Australia [74] | National hospital morbidity database | 2005 | 0 vs. 1 | 2006–10 vs. 1998–9 | ↓52.7% |
| USA [58] | Kaiser group | 1995 (Dose 1) 2006 (Dose 2) |
0 vs. 2 | 2009 vs. 1994 | 0.25 vs. 2.13/100,000 (↓90%) |
| USA [68] | Truven claims data | 1995 (Dose 1) 2006 (Dose 2) |
0 vs. 2 | 2012 vs. pre-vaccination | ↓93% (↓38% vs. one dose period) |
| USA; Connecticut [126] | Hospital discharge data | 1995 (Dose 1) 2006 (Dose 2) |
0 vs. 1 | 2001–5 vs. 1994–5 | ↓83% (p < 0.001) |
| Taiwan [65] | National Health Insurance Claims Database | 2004 | 0 vs. 1 | 2004–8 vs. 2000–3 | Non-specified significant reduction |
| Costa Rica [56] | ational surveillance data | 2007 | 0 vs. 1 | 2015 vs. 2008 | ↓85.9% (↓87% (<5 years)) |