This is the 4712th most frequent Arabic word.
الإنفلونزا
The flu.
In this sentence, 'الإنفلونزا' is used to refer to the disease, contextualizing its effects (fatigue) on the speaker.
أنا أشعر بالكثير من التعب بسبب الإنفلونزا.
I feel a lot of fatigue because of the flu.
Here, 'الإنفلونزا' denotes the medical diagnosis given by the doctor, describing the type of illness.
قامت الطبيبة بتشخيص حالتي بأنها الإنفلونزا عادية.
The doctor diagnosed my condition as common flu.
In this example, 'الإنفلونزا' is described as the target disease for vaccination, showing its preventative context.