Table 2. Viral detection in respiratory samples in asymptomatic children.
| Year | Seasona | Numberb | Age | Risk Group | Viral Findings | |||||||||
| n (%) | ||||||||||||||
| Picorna | AdV | HBoV | RSV | hMPV | CoV | IV | PIV | Polyoma Viruses | ||||||
| HRV | EV | |||||||||||||
| 2011 [67] | Autumn, winter, spring | 66 | 6 m–3 y | Healthy | 28 (42%) | 5 (7.6%) | 4 (6.1%) | 13 (20%) | 6 (9.1%) | 1 (1.5%) | 5 (6.1%) | 0 (0%) | 6 (9.1%) | WU 9 (14%); KI 1 (1.5%) |
| 2011 [99] | All year | 34 | <1 y | Healthy | 8 (24%) | |||||||||
| 51 | 1–4 y | Healthy | 7 (14%) | |||||||||||
| 69 | 5–19 y | Healthy | 9 (13%) | |||||||||||
| 2011 [95] | Winter | 30 | <1 y | Healthy | 6 (18%) | 0 (0%) | 1 (3%) | 3 (9%) | 2 (6%) | 0 (0%) | 6 (18%) | 2 (6%) | 0 (0%) | |
| 23 | 1–2 y | Healthy | 4 (16%) | 0 (0%) | 0 (0%) | 0 (0%) | 0 (0%) | 0 (0%) | 2 (8%) | 0 (0%) | 0 (0%) | |||
| 97 | 2–6 y | Healthy | 14 (15%) | 1 (1%) | 0 (0%) | 2 (2%) | 1 (1%) | 0 (0%) | 3 (3%) | 3 (3%) | 0 (0%) | |||
| 2010 [68] | All year | 570 | <2 y | Healthy | 94 (17%) | 20 (3.5%) | 3 (0.5%) | 0 (0%) | 8 (3.6%) | 3 (0.6%) | 4 (1.8%) | |||
| 436 | <2 y | At risk | 103 (24%) | 37 (8.5%) | 2 (0.5%) | 3 (1.8%) | 6 (3.5%) | 2 (0.5%) | 3 (1.8%) | |||||
| 2010 [98] | Autumn, winter | 272 | <3 y | Rural | 3 (1.1%) | 1 (0.4%) | 2 (0.7%) | 5 (1.8%) | ||||||
| 2010 [97] | All year | 57 | <12 y | Rural | 2 (4%) | |||||||||
| 2010 [100] | All year | 425 | <3 y | At risk | 140 (33%) | 68 (16%) | 18 (4%) | 29 (7%) | 15 (4%) | 3 (1%) | 13 (3%) | |||
| 2009 [101] | Autumn, winter, spring | 65 | <7 y | Healthy | 14 (22%) | 2 (3%) | 0 (0%) | 0 (0%) | 0 (0%) | 5 (8%) | 0 (0%) | |||
| 2008 [102] | All year | 116 | <14 y | Healthy | 11 (9.5%) | 5 (4.3%) | 2 (1.7%) | 1 (0.8%) | 1 (0·8%) | 0 (0%) | 0 (0%) | 0 (0%) | ||
| 2008 [112] | Autumn, winter, spring | 100 | ≤3 y | Healthy | 43 (43%) | |||||||||
| 2007 [103] | Autumn, winter, spring | 269 | 1.5–9.3 y | Healthy | 29 (11%) | 2 (1%) | 2 (1%) | 1 (0%) | 1 (0%) | |||||
| 2006 [96] | All year | 456 | <1 y | High risk of atopy | 52 (11%) | 2 (0%) | 24 (5%) | 1 (0%) | 20 (4%) | 0 (0%) | 4 (1%) | |||
| 2006 [104] | All yearc | 410 | 1–9 y | Healthy | 37 (9%)d | |||||||||
| 2004 [94] | NS | 70 | 5 m | Healthy | 12 (17%) | 2 (3%) | 3 (4%) | 1 (1%) | 1 (1%) | |||||
| 64 | 1 y | Healthy | 18 (28%) | 0 (0%) | 0 (0%) | 0 (0%) | 0 (0%) | |||||||
| 38 | 1.5 y | Healthy | 10 (26%) | 0 (0%) | 0 (0%) | 0 (0%) | 0 (0%) | |||||||
| 49 | 2 y | Healthy | 7 (14%) | 0 (0%) | 1 (2%) | 0 (0%) | 0 (0%) | |||||||
a
Related to geographical area.
b
Number of samples tested.
c
Stratified for season.
d
Picornavirus general.
M, months of age; Y, years of age; HRV, human rhinoviruses; EV, entero viruses; AdV, adeno viruses; HBoV, human bocavirus; RSV, respiratory syncytial virus; hMPV, human metapneumovirus; CoV, corona viruses; IV, influenza viruses; PIV, para-influenza viruses; NS, not specified.