Table 3. Natural transformation of C. jejuni at varying temperature and atmospheric conditions^a,b.

Temperature	Oxygen level
	Aerobic	Microaerobic	Anaerobic
20°C	0.11±0.13	0.16±0.27	Nd.c
30°C	15.1±8.92	19.6±7.37	Nd.c
37°C	97.3±10.3	Index 100b ±55.5	28.1±12.9
42°C	130±50.8	353±37.8	16.2±6.49

^aExponentially growing cells were supplied with isogenic chromosomal DNA at 1∶2.5 ratio (CFU:DNA) and transformation was allowed to proceed for 4 h before plating on selective agar. Results are the average of three independent experiments with two replicates.

^bResults are normalized to the number of transformants per ml at 37°C under microaerophilic conditions.

^cNot determined.