In 1954, Paul Hurd, Jr*. an entomolgist at UC Berkeley was using an aspirator to collect insects in Alaska. Two months later, he became ill. During the first week of his illness, several live insects passed from the left antrum of his sinuses. These included 3 rove beetles, 13 fungus gnat larvae, 3 hymenopteran egg parasites and about 50 springtails. Since the screen on the aspirator would have excluded adult insects, Hurd concluded that eggs entered his sinuses, hatched and developed. Beware of mouth aspiration!
With miniaturization of electronics, it should be possible to elimanate mouth suction altogether. Some entomologists still use mouth aspiration, primarily due lack of availability of an appropriate electronic device.
*Paul Hurd. 1954. Myiasis resulting from the use of the aspirator method of collection of insects. Science. 119:814-815.