HOUSTON – BreatheMD is offering free testing for several dozen people as part of a study to see whether nasal swabs or saliva testing, which consists of spitting into a cup, is more effective. BreatheMD has teamed up with Microgen Diagnostics a lab and research facility to conduct the testing. “Part of our study is to gain more data comparing the swab to the saliva but so far the data shows the saliva is favorable,” Bowden said. Bowden said once the study is completed, BreatheMD will continue to offer testing but it will cost patients $200. BreatheMD said it has offered testing since March 13 and have tested 600 people so far.