The phrase "a single introduction of" is correct and usable in written English.
It can be used when referring to the act of presenting or introducing something once, typically in a formal or academic context.
Example: "The study was based on a single introduction of the new methodology to the participants."
Alternatives: "a sole introduction of" or "one introduction of".
A: We still believe it was caused by a single introduction of the virus into the human population.
Consistent with a recent report (Faria et al., 2016), our results also suggested a single introduction of ZIKV into South America (Fig. 1C).
That tree revealed that the children's viruses formed a tight-knit family as would be expected if they stemmed from a single introduction of HIV to the hospital, which was then passed to many different patients.
In contrast, two very similar strains have been described in passerine birds from the Galapagos Islands, both within the canarypox virus cluster, and similarly distinct from the fowlpox virus found in Galapagos chickens [12], suggesting the possibility of a single introduction of the canarypox virus, separate from introduction(s) of fowlpox virus.
Overall, the phylogeny of EFL provides strong evidence for differential loss of EFL and EF-1α in the kinetoplastid lineage, and the general failure of AU tests to reject euglenozoan EFL monophyly leaves open the possibility that differential loss after a single introduction of EFL may explain the entire distribution of EFL and EF-1α in Euglenozoa as a whole.
Among them the USUV strains originating from Vienna and Budapest showed the highest nucleotide identity rates with the Italian viruses, implying that - following a single introduction of USUV to central Europe - the same USUV strain is now circulating in central Europe.
That might make sense for an introduced species: it could be the result of a single introduction, or rather of two introductions, one for each supercolony.
In the extreme case, it is even possible that they correspond to a single introduction and fixation of different S-alleles and subsequent somatic mutations in different populations.
Secondly, our estimation method assumes a single introduction as the source of infection for an IP.
Hence, under the hypothesis of a single introduction and spread, selection would have occurred on European populations of C. gigas for about 40 generations.
The introduction history of this mosquito is not precisely known, but mitochondrial haplotype analysis supports the hypothesis of a single introduction (Usmani-Brown et al. 2009), making this another possible example of a genetically restricted population undergoing rapid CDL evolution.
