AIM: A seasonal variation was noted in the incidence of amoeba-like keratitis in Iowa. The level of contamination of amoeba in surface water has been found previously to vary on a monthly basis for Tulsa, Oklahoma, a region with a similar climate. It was hypothesised that this seasonal variation in amoeba-like keratitis correlated with the concentration of amoeba in surface water. METHODS: The monthly variation in the onset of symptoms was determined and date of diagnosis in 137 cases of amoeba-like keratitis, in Iowa, from January 1993 to the end of December 1996. RESULTS: Over a 4 year period a significant variation was found, on a monthly basis, in the onset of symptoms as reported by the patient. There were two peak periods per year when the onset of symptoms was most frequent: June and November. This corresponded closely with the concentration of amoeba in the ground water reported for a similar region in the mid-west (Tulsa, Oklahoma). A yearly increase was found in the number of cases diagnosed from January 1993 to the end of December 1996. CONCLUSIONS: This study supports the hypothesis that the concentration of amoeba in surface water may influence the rate of an amoeba-like keratitis infection.
AIM: A seasonal variation was noted in the incidence of amoeba-like keratitis in Iowa. The level of contamination of amoeba in surface water has been found previously to vary on a monthly basis for Tulsa, Oklahoma, a region with a similar climate. It was hypothesised that this seasonal variation in amoeba-like keratitis correlated with the concentration of amoeba in surface water. METHODS: The monthly variation in the onset of symptoms was determined and date of diagnosis in 137 cases of amoeba-like keratitis, in Iowa, from January 1993 to the end of December 1996. RESULTS: Over a 4 year period a significant variation was found, on a monthly basis, in the onset of symptoms as reported by the patient. There were two peak periods per year when the onset of symptoms was most frequent: June and November. This corresponded closely with the concentration of amoeba in the ground water reported for a similar region in the mid-west (Tulsa, Oklahoma). A yearly increase was found in the number of cases diagnosed from January 1993 to the end of December 1996. CONCLUSIONS: This study supports the hypothesis that the concentration of amoeba in surface water may influence the rate of an amoeba-like keratitis infection.
Authors: E J Cohen; H W Buchanan; P A Laughrea; C P Adams; P G Galentine; G S Visvesvara; R Folberg; J J Arentsen; P R Laibson Journal: Am J Ophthalmol Date: 1985-09-15 Impact factor: 5.258
Authors: Lauren J Stockman; Carolyn J Wright; Govinda S Visvesvara; Barry S Fields; Michael J Beach Journal: Parasitol Res Date: 2010-10-27 Impact factor: 2.289
Authors: Thiago Dos Santos Gomes; Angela Magnet; Fernando Izquierdo; Lucianna Vaccaro; Fernando Redondo; Sara Bueno; Maria Luisa Sánchez; Santiago Angulo; Soledad Fenoy; Carolina Hurtado; Carmen Del Aguila Journal: PLoS One Date: 2016-04-22 Impact factor: 3.240
Authors: Anna C Randag; Jeroen van Rooij; Arnoud T van Goor; Samuël Verkerk; Robert P L Wisse; Isabelle E Y Saelens; Remco Stoutenbeek; Bart T H van Dooren; Yanny Y Y Cheng; Cathrien A Eggink Journal: PLoS One Date: 2019-09-06 Impact factor: 3.240