The phrase "an initial bout of" is correct and usable in written English.
It can be used to describe the first occurrence of something, often in the context of illness or a specific event.
Example: "After an initial bout of flu, she decided to take better care of her health."
Alternatives: "a first episode of" or "an early instance of".
After an initial bout of work on AI with Aldiss in the early 70s, it was shelved, partly in response to Star Wars.
After an initial bout of wooziness — discernible to viewers of the final episode of HBO's "24/7" series on the Winter Classic — Crosby reported being symptom-free and finished the game.
It was on that first night, Mr. Hicks said, that Mr. Shadid suffered an initial bout of asthma, apparently set off by an allergy to the horses, but he recovered after resting.
We conclude that supplementation with intact™ powder did not increase plasma IGF-I concentrations or improve performance during an initial bout of incremental running to exhaustion in our sample.
I approached Collins after his band's set and an initial bout of sea-induced vertigo.
In fact, after an initial bout of deep sleep, we'll find ourselves waking up frequently throughout the night.
When Brookings checked in with those who had been unemployed for more than six months, now 15 months after their initial bout of unemployment, a third weren't working and had given up their search.
npr-1 215V signallingsignaling in RMG prevents 21% O2 from evoking persistent rapid movement (A ), and sustained inhibition of reversals (B ), but does not affect the initial bout of reversals evoked by a rise in O2 (C ).
Though he recovered from the initial bout of symptoms, he relapsed about a week later, and on August 18 Farrar was hospitalized with severe dehydration and high fever.
Swisher acknowledged that the initial bout of discomfort was more painful than he initially let on, when he sat out last Thursday's game in Detroit.
Umi died because she'd been weakened by that initial bout of hunger, and because she lived miles from the nearest hospital.
