Table 2.

Frequency of Pseudomonas sp. as a causative agent of microbial keratitis in different geographical regions

Geographical region	Country	Frequency (%) of Pseudomonas sp. as a total of all MK isolates
North America	USA1	0
	USA2	20.2
South America	Brazil3	12
	Brazil28	12 (41% of these caused by P. aeruginosa)
Europe	UK29	6 (1995–1998); 15 (2004–2007)
	UK4	12
	UK5	21
	UK6	28.5 (24.3% of total cases caused by P. aeruginosa)
	UK30	20.9
	Ireland7	33.3 (56.2 of CLMK)
	The Netherlands8	22.4
	Turkey9	6.6 (Pseudomonas sp.)
	Italy10	72.2
Middle East	Iraq31	42 (100% of those associated with contact lenses caused by Pseudomonas sp.)
	Kingdom of Bahrain32	54 (95% of those associated with contact lenses caused by P. aeruginosa)
	Various27 (predominantly Iraq)	71
	Oman33	28.8 (all CLMK)
Africa	Sierra Leone34	40
	Nigeria35	22.4
Indian subcontinent	India36	71 (only cases of CLMK examined, all Pseudomonas species were P. aeruginosa)
	India37	52
	India11	1
	India12	24.4
Asia	Japan38	2.8
	Japan18	20
	Japan13	1
	Thailand16	59
	Thailand17	55
	Malaysia15	58.6
	Hong Kong39	42.9 (85.7 of culture proven) for CLMK
	China40	20.07
	Taiwan41	47
Australasia	New Zealand42	3.4 (all P. aeruginosa)
	Australia43	8
	Australia21	17 (55% of these caused by P. aeruginosa)
	Australia44	35 (CLMK; 49.2 of culture proven cases)