The phrase "affected at first" is correct and usable in written English.
It can be used to describe an initial impact or influence on someone or something before any changes occur.
Example: "She was affected at first by the news, but later she found a way to cope."
Alternatives: "impacted initially" or "influenced at the outset".
The government's auto-enrolment project was rolled out in 2012 – but only large companies were affected at first.
Ben Page of Ipsos Mori says the coalition is betting that 70% of voters will not be much affected, at first.
This may be because they really weren't sure which muscles were affected many years before, or because muscles were so mildly affected at first that doctors didn't detect it on physical examination at the time of the polio virus infection.
Accordingly, the soft tissues such as the lip, tongue, soft palate, and others will be affected at first when the mandible moves posteriorly.
On average, glycolysis was affected at first, followed by TCA-cycle intermediates.
Nine subjects (seven males and two females), already considered to be affected at first evaluation, showed disease progression in terms of ECG, SAECG, two-dimensional echo abnormalities, and electrical instability.
Marwood banging on about his dead wife was affecting at first but, God, it got dreary after a while.
Quite differently, SeUAP (FJ380203) expression was slightly affected at the first testing point, and the repressed transcription level of SeUAP was only observed at 24 hr and 72 hr post-injection with a detectable but subtle increase in expression at 108 hr after dsEcRcom injection (Fig. 5D).
In fact, genes in asperthecin (AN6000, aptA), penicillin (AN2623) and sterigmatocystin (AN7812, AN11013 and AN7811) clusters were amongst those more profoundly affected at the first time point (Table 1).
Maybe one-third of them will not be affected at all, one-third on a permanent level and maybe a third in a profound way but will revert back to their old selves over a period of time.
The grandson (III. 2 in Fig. 1), son of the index patient's second daughter was first affected at the age of 33.
