does a-v vendors collects undetectable virus samples from jotti

in jotti homepage all antivirus missed some viruses so antivirus vendors are they collecting undectable virus samples so that they get detected in the next update

[Firecat]

If any virus is not detected by any of the AVs on Jotti's page, the file is submitted to the companies which did not detect the virus, so that detection can be added later.

There is no bias, all companies recieve the viruses which were not detected through Jotti.