. 2017 Aug 24;61(9):e00535-17. doi: 10.1128/AAC.00535-17

TABLE 4.

Tested antimicrobial agents and dilution ranges

Antimicrobial	Company^a	Order no.	Dilution range (mg/liter)		Breakpoint (mg/liter)^b	Stock concn (mg/ml), diluent^c
Antimicrobial	Company^a	Order no.	B. burgdorferi sensu lato	Relapsing-fever Borrelia strains	Breakpoint (mg/liter)^b	Stock concn (mg/ml), diluent^c
Amoxicillin	Centrafarm	14029596	0.25–128	0.25–128	≤4	8.89, PBS
Doxycycline	Sigma-Aldrich	D3447	0.03–8	0.004–2	≤4	44.4, DMSO
Ceftriaxone	Sigma-Aldrich	PHR1382	0.008–4	0.008–4	≤8	4.44, PBS
Azithromycin	Sigma-Aldrich	PHR1088	0.0001–0.05	0.0001–0.05	≤2	5.56, DMSO
Amikacin	Sigma-Aldrich	A1774	2–1,024	2–1,024	≤16	11.26, MKP

Locations: Centrafarm, Etten-Leur, the Netherlands; Sigma-Aldrich, St. Louis, MO, USA.

According to the Clinical and Laboratory Standards Institute.

PBS, phosphate-buffered saline; DMSO, dimethyl sulfoxide; MKP, modified Kelly-Pettenkofer medium. The DMSO concentrations used in our studies did not influence Borrelia viability (data not shown).