Table 3. Changes in microbial abundance.

Results of Wilcoxon signed-rank tests on the changes in microbial loads. The change in microbial loads was calculated by subtracting microbial load at day 3 from that at day 18; thus positive signed-rank value mean increases in microbial loads during incubation and vice versa.

Microbial entity	Naturally incubated magpie eggs (n = 31)
	Rural (n = 14)		Urban (n = 17)
	S	P	S	P
Total bacteria	6.5	0.715	47.5	0.023
Escherichia coli/Shigella spp.	40.5	0.009	-6.5	0.782
Surfactin-producing Bacillus spp.	-23.5	0.153	-31.5	0.145
Candida albicans	-42.5	0.005	-62.5	0.002