Table 1. Summarised distribution of MHC-I alleles and supertypes in two sympatric Mastomys species (M. natalensis and M. erythroleucus).

Rodents were trapped in two distinct sites in Nigeria: Abagboro, a non-endemic site for Lassa fever, and Ebudin, an endemic site for Lassa fever.

	M. natalensis n = 189		M. erythroleucus n = 67
Number of individuals allocated by species and locality	Abagboro 76	Ebudin 113	Abagboro 4	Ebudin 63
Number of nucleotide alleles	27 allele sequences shared between species
	193 {166 private}		96 {69 private}
Mean number of nucleotide alleles per individual {range}	28.27 {9–43}		19.69 {9–30}
Number of amino acid alleles	162		87
Number of supertypes	21		15
Mean number of supertypes per individual {range}	13.16 {4–19}		8.97 {5–12}