The black ones DO have little tabby stripes! From what I understand though, they usually fade and become solid black.

The kittens were found on a farm, and have been in foster care nearly a week, but the foster mom couldn't take them to work with her, so she had to find alternate arrnagements til they could feed themselves. The other three kittens found last month on the same farm tested negative, so she has hopes these 4 will test negative too.