High-Throughput 16 S rRNA Gene Sequencing Reveals Bacterial Diversity of Infant Formula Production Line Samples in Spring and Summer

Table 1

List of sampling points in the infant milk formula production line.

Sampling point		Sample number	Sample status	Sampling purpose	Sampling method
Material	Raw milk	M/J01	Liquid	Critical Control Point (CCP) 1
Net milk cooling	Liquid milk mixed before pasteurization	M/J02	Liquid	CCP2	A
Pasteurization	Liquid milk after pasteurization	M/J03	Liquid	To study the changes of bacterial diversity after pasteurization
	Water	M/J04	Liquid
	Soybean oil	M/J05	Liquid
	α-Whey protein powder	M/J06	Powder
	Polyfructans	M/J07	Powder
Excipients	Oligofructans	M/J08	Powder	CCP1	B
	Mineral	M/J09	Powder
	Arachidonic acid	M/J10	Solid
	Multivitamins	M/J11	Powder
	Whey protein	M/J14	Powder
	Skim milk	M/J15	Powder
Adding excipients	Pasteurized milk added with excipients	M/J12	Liquid	Potential risk
Evaporation	Concentrated milk	M/J13	Liquid	CCP3	A
Cooling	Fluidized bed	M/J16	Powder	Potential risk
	Dust of canning	M/J17	Cotton swab		C
The dust of dry spray	Dust off feeding room table	M/J18	Cotton swab	Environmental surveillance
	Dust off feeding room ground	M/J19	Cotton swab
Feeding environment	Feeding cover	M/J20	Cotton swab	Potential risk
	Feeding bottom	M/J21	Cotton swab
	Feeding table	M/J22	Cotton swab
Cling wrap	Package film	M/J23	Cotton swab	CCP4
	Package film exchange platform	M/J24	Cotton swab
Workers	Hands	M/J25	Cotton swab	Potential risk
	Soles	M/J26	Cotton swab
	Tooling	M/J27	Cotton swab