Answer:
The first and advisable thing to do is to Clean up the vomitus carefully using Standard Precautions since there's a high chance of the vomitus to be infectious.
I'd say, ina general way, that the most imporant cells in defense against parasitic organisms are definitely white blood cels, the cells responsible for defeating antigens, pathogens and deseases.
Although these might be the most important ones in that specific task (defending against parasitic organisms), all the cells in the immune system, along with other non-cell things are important, since they all play a specific role indispensable in our immune system.
Hope it helped,
BioTeacher101
Lower then your diaphragm around your liver
