Herpes simplex keratitis can occur in the context of primary herpes simplex virus infection but is observed more frequently in secondary or recurrent disease.
单纯疱疹性角膜炎可以原发性单纯疱疹病毒感染的形式发生，但其一般常继发于其它疾病或反复发作。
2
But the risk of a secondary catastrophe, of disease and starvation, remained high.
不过，缅甸再次面临疾病和饥饿等灾害的风险依然很高。
3
Symptoms may occur secondary to trauma, retinal disease, or diabetes.