Composition of amino acids responsible for receptor binding among plaque purified viruses obtained from ferret nasal washes.

* No detectable ElSalv/57 virus was isolated from nasal washes (day 6 p.i.) during a respiratory droplet transmission experiment.
** Refers to the number of plaque purified viruses containing that specific codon in relation to the number of numbers of plaque purified viruses that were analyzed by nucleotide sequencing.
¶Same results were obtained in the nasal wash samples collected on day 4 p.i.