Although pH1N1 was the most common influenza virus detected, seasonal influenza A/H3N2 and A/H1N1 (and other respiratory viruses) were circulating at the same time, at least early in the pandemic [13].
The viruses circulating at the same time of a year are more likely to accompany each other [ 7, 11, 13].
A cross-protective immune response could explain why these 2 human coronaviruses do not circulate at the same time.
We detected 2 HBoV genotypes circulating at the same time in both symptomatic and asymptomatic children during the winter of 2002 2003 in Quebec.
Of interest, another lineage of EV-A71 subgenogroup C4 representing an independent introduction from China was circulating at the same time in Central Russia and Stavropol region.
The different isolates obtained from garganey from the Inner Niger Delta also indicate that various subtypes are circulating at the same time in a population, a finding that agrees with patterns observed in Europe and North America (11, 13 ).
These strains are genetically similar to B genogroup viruses circulating in Japan during 1997 (V-14433, V-14429, C7/Osaka) but are distinct from the B3 genogroup of viruses circulating at the same time in Sarawak (e.g., MY104-9/SAR/97 and SK-EV006).
In the absence of any information on measles incidence in North and South Kivu during 2004 2006, one may speculate that B2-KIN-A strains could have been imported from the east into Kinshasa in 2004 but continued to circulate at the same time in this region bordering Rwanda.
They demonstrated that in none of the patients, TAA-specific T cells were found both in tumor tissue and circulating blood at the same time.
Only DENV-1 was isolated during this epidemic, while DENV-1, DENV-2, and DENV-3 circulated in Puerto Rico at the same time (8 ).
