<p>Each subtype (colored boxes) and specific H1N1 strains used for analysis in this study are depicted chronologically.</p
<p>Each colored ball represents a virus. The different colors mark its collection year. The five vac...
H1N1 is the earliest emerging subtype of influenza A viruses with available genomic sequences, has c...
H1N1 is the earliest emerging subtype of influenza A viruses with available genomic sequences, has c...
<p>Schematic representation of the passage history and infection experiments with influenza viruses ...
<p>Seropositive samples for historical influenza A H1N1 strains (A/Brisbane/59/2007, Denver/1/1957 a...
<p>The percentage of serum samples that were HAI positive per decade of birth were identified for (A...
<p>The phylogram was constructed by maximum parsimony method using MEGA 3.1 software. Branch lengths...
Detailed records of the influenza A viruses analyzed in this study, including strain names, host ori...
<p>Different colors represents different influenza subtypes as is listed in the head.</p
<p><b>(a)</b> The phylogenic tree of HA genes of the influenza vaccine strains. <b>(b)</b> Heat map ...
<p>Cough samples were collected from individual patients and subjected to viral quantification. The ...
<p>The overall % positivity of types and subtypes is shown for each city. The left axis shows the pe...
<p>Different colors represents different influenza subtypes as is listed in the head.</p
<p>ML phylogram of influenza A subtype H1. Branch lengths represent genetic distance. Dots show node...
<p>For each pathogen, the number of patients in whom this pathogen was detected (including single an...
<p>Each colored ball represents a virus. The different colors mark its collection year. The five vac...
H1N1 is the earliest emerging subtype of influenza A viruses with available genomic sequences, has c...
H1N1 is the earliest emerging subtype of influenza A viruses with available genomic sequences, has c...
<p>Schematic representation of the passage history and infection experiments with influenza viruses ...
<p>Seropositive samples for historical influenza A H1N1 strains (A/Brisbane/59/2007, Denver/1/1957 a...
<p>The percentage of serum samples that were HAI positive per decade of birth were identified for (A...
<p>The phylogram was constructed by maximum parsimony method using MEGA 3.1 software. Branch lengths...
Detailed records of the influenza A viruses analyzed in this study, including strain names, host ori...
<p>Different colors represents different influenza subtypes as is listed in the head.</p
<p><b>(a)</b> The phylogenic tree of HA genes of the influenza vaccine strains. <b>(b)</b> Heat map ...
<p>Cough samples were collected from individual patients and subjected to viral quantification. The ...
<p>The overall % positivity of types and subtypes is shown for each city. The left axis shows the pe...
<p>Different colors represents different influenza subtypes as is listed in the head.</p
<p>ML phylogram of influenza A subtype H1. Branch lengths represent genetic distance. Dots show node...
<p>For each pathogen, the number of patients in whom this pathogen was detected (including single an...
<p>Each colored ball represents a virus. The different colors mark its collection year. The five vac...
H1N1 is the earliest emerging subtype of influenza A viruses with available genomic sequences, has c...
H1N1 is the earliest emerging subtype of influenza A viruses with available genomic sequences, has c...
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