Throughout history, slavery has been plagued with the infection, disease, and other immunological disorders arising from a particular people group being forcibly transported to a working environment in which their immune systems have not had time to adapt.
One example would be the sicknesses that beset African-Americans brought to the Caribbean by British and French slavers during the 17th century. Although nearly half of all slave deaths may have occurred before the slaves even reached the Americas, even after they arrived in the Caribbean life-expectancy was only 20 more years. This was due to their inability to adapt to diseases and illnesses present in Jamaica and other such places, while under the strain of incredibly hard forced labor (though certain slavers made point of not giving new slaves the hardest jobs, so as to protect their investment).
So my scenario is this: aliens have visited Earth, and taken humans back to their homeworld with them as slaves. Assuming the aliens are humanoid and the planet is Earth-like, my assumption is that a situation similar to that of African-American slaves in the Caribbean might play out.
But for the purposes of my story, this is not the situation I want to play out. I'm wondering, instead, if there's any way this could all unfold in reverse, that is, is there any way that, instead of the humans becoming infected with various diseases present on the alien planet that they've not had time to adapt to, could they instead bring an Earth disease with them, one that they are immune to, but the aliens are not? In other words, is there any way that humans, brought as slaves by aliens to the alien homeworld, could inflict disease and other immunological failures on the aliens, and not the other way around, as has usually been the case throughout the history of human enslavement of other humans?