Final answer:
Individuals with compromised immune systems, such as the very young, the elderly, and those with certain health conditions, are most susceptible to fungal infections. These infections are tough to treat due to their resistance to traditional antibiotic therapy and are more likely in environments favorable to fungal growth.
Step-by-step explanation:
The group of people most vulnerable to fungal infections are those with compromised immune systems. This includes, but is not limited to, the very young, whose immune defense mechanisms are still developing, the elderly, who may have declining immune strength and individuals with health conditions such as AIDS that severely weaken the immune response. Additionally, those who have been using antibiotics extensively, since antibiotics can alter the natural balance of bacteria and yeasts in the body, may also be more susceptible to opportunistic fungal infections like Candida or Pneumocystis. Fungal infections are a concern because they are resistant to traditional antibiotic therapy and require specific antifungal treatments.
Some environments also foster fungal growth, such as sweaty shoes, communal showers, and locker rooms; people in these environments may be more exposed to dermatophytic fungi, which can lead to infections like athlete's foot. Moreover, opportunistic mycoses can occur when common environmental fungi or fungi that are usually a harmless part of our microbiota take advantage of a weakened immune system.