The phrase "as infrequent" is correct and usable in written English.
It can be used to compare the frequency of an event or occurrence to something else, often implying that it happens rarely.
Example: "The meetings are scheduled as infrequent as possible to accommodate everyone's busy schedules."
Alternatives: "as rare" or "as uncommon".
Public sightings are as infrequent as ever, and interviewers have had to sign non-disclosure agreements.
And in Smith Point, hard freezes are as infrequent as a smog-free view of Houston across the bay.
He treasured his solitary spells in this house, as infrequent as they were, and he tended to waste very few minutes of them.
He and his neighbors had spent weeks inside their houses, he said, trying to keep trips outside as infrequent as possible because they feared Colonel Qaddafi's security forces.
However, voter fraud is exceedingly rare, and about as infrequent as death by lightning strikes, according to the Brennan Center for Justice at New York University School of Law.
Detailed descriptions of spinal-cord injury date back to the first known medical document, an Egyptian papyrus from 1600 B.C., but it was not until the First World War that interest in treating it began in earnest; before then, it was as infrequent as it was devastating.
After a 10-year span in which communication between David Bowie and his devoted listeners had become about as infrequent as the transmissions between ground control and Major Tom, that protean rock star said on Tuesday — his 66th birthday — that he had released a new single, "Where Are We Now?" in advance of a new album, "The Next Day," coming in March.
But updated media coverage of this country appears as infrequent as humanitarian aid.
The stride at each position could be chosen so that the k-mers whose occurrences are in the index are as infrequent as possible.
The schedule for measuring PM10 and PM2.5 in each county is not always daily, and in some counties it may be as infrequent as once in every 6 days for PM10 and once in every 3 days for PM2.5.
If, however, it turns out that digenic and oligogenic conditions are more common than originally anticipated, then many disease contributory variants will have evaded purifying selection, and hence those variants that in combination (but not individually) have significant pathogenic potential will not be as infrequent as might be expected under the CDRV hypothesis.
