Who are immuncompromised?

Immuncompromised are the people who are at high risk by the invasion of foreign organisms or pathogens. Reasons may be their comorbidity and age.
      We have immune system that produces chemicals and releases cells called macrophages that swallow these foreign organisms, thereby protecting us. But not everyone has a strong immune system and such people are immuncompromised. Their body may not produce enough chemicals and macrophages to fight the infection and so they are more precarious to get an infection