The new saliva test is simple, cost effective and easy with equivalent specificity and sensitivity to well-established ELISA tests. In the new saliva test, antigens are attached to fluorescent beads which can circulate more easily through a liquid, potentially encountering more antibodies to a disease if they are present in saliva. This test allows for testing of a number of different antigen targets within the same saliva sample.

So, one can test for multiple different infections in a single saliva sample. Source: ET Health What are the bottlenecks in the current tests that need thorough revisions to be more effective?