Table 4. Match between influenza virus strains isolated from case patients in San Juan de Dios Hospital and influenza vaccine formulations available during 2008–2010, El Salvador.
| Year | Strain dominancea |
Formulation |
Best match, by hemisphere |
||||||
|---|---|---|---|---|---|---|---|---|---|
| Strain | Dominance | Southern hemisphere | Northern hemisphereb | Southern | Northern | Neither | |||
| 2008 | A/Brisbane/59/2007-like (H1N1) | Co-dominant | A/Solomon Islands/3/2006 (H1N1)-like virus | A/Brisbane/59/2007 (H1N1)-like virus | X | ||||
| B/Florida/04/2006-like | Co-dominant | A/Brisbane/10/2007 (H3N2)-like virus | A/Brisbane/10/2007 (H3N2)-like virus | ||||||
| B/Florida/4/2006-like virus | B/Florida/4/2006-like virus | ||||||||
| 2009 | A/California/07/2009-like (H1N1)pdm | Dominant | A/Brisbane/59/2007 (H1N1)-like virus | A/Brisbane/59/2007 (H1N1)-like virus | X | ||||
| A/Brisbane/10/2007 (H3N2)-like virus | A/Brisbane/10/2007 (H3N2)-like virus | ||||||||
| B/Florida/4/2006-like virus | B/Brisbane/60/2008-like virus | ||||||||
| 2010 | A/Perth/16/2009 (H3N2) | Co-dominant | A/California/7/2009 (H1N1)-like virus | A/California/7/2009 (H1N1)-like virus | X | X | |||
| B/Brisbane/60/2008-like | Co-dominant | A/Perth/16/2009 (H3N2)-like virus | A/Perth/16/2009 (H3N2)-like virus | ||||||
| B/Brisbane/60/2008-like virus | B/Brisbane/60/2008-like virus | ||||||||
a Strains were considered dominant if they accounted for ≥ 70% of the annual isolates and were considered co-dominant if they accounted for at least 40% but less than 70% of the annual isolates.
b Northern hemisphere vaccine compositions are expressed as the year when epidemics start (i.e. 2008 refers to the 2008–2009 season).
Data source: World Health Organization25.