The phrase "affected during the first" is correct and usable in written English.
It can be used in contexts discussing impacts or changes that occurred in the initial phase of a process or event.
Example: "The results of the study indicated that participants were significantly affected during the first week of the intervention."
Alternatives: "impacted in the initial" or "influenced during the first phase".
Results from the global transcriptional studies indicated that apoptotic cell death and cell cycle regulation are affected during the first days after 177Lu-octreotate treatment.
While the ChIP-chip analysis revealed that NKX2.1 is a target of PARP3, expression of nkx2.1a does not seem to be markedly affected during the first day of zebrafish development.
The patients affected during the first phase of the outbreak excreted the pathogen in the environment.
The healing of the blister wound was not affected during the first 4 days of the study.
All of the regions but two (Provence-Alpes-Côte d'Azur in south-eastern France and Corsica) were affected during the first wave.
Interestingly, miR156 expression was not affected during the first 9 days of induction, whereas that of EgSPL5 in mature cuttings decreased after 1 day and remained low.
UNICEF was founded in 1946 as the United Nations International Emergency Children's Fund to help children affected during the Second World War.
The results indicated that some biological processes were significantly affected during the second photoperiod under LD conditions.
The extract did not affect food consumption of male rats but the females were negatively affected during the second week of treatment (Table 2).
The variability in excess mortality rates across affected provinces in winter 1919 was partly explained by baseline mortality and infant mortality rates, which suggests that infants <1 year were significantly affected during the third wave of the pandemic [ 3].
The rationale for studying gene expression in late fetuses was that expression of many genes is affected during the last third of gestation [ 21], a key period in the fiber differentiation/specialization process in cattle, which are mature at birth with regard to muscle physiology [ 22].
