New parasites on the block: emerging intestinal protozoa

Area of Science:

• Clinical Medicine
• Infectious Diseases
• Parasitology

Background:

• Converging medical trends elevate the importance of intestinal protozoan infections.
• Human immunodeficiency virus (HIV) and acquired immunodeficiency syndrome (AIDS) lead to opportunistic infections.
• Immunosuppressive agents for transplants increase susceptibility to chronic parasitic infections.

Purpose of the Study:

• To review four protozoan infections of increasing clinical significance.
• To discuss newly discovered or increasingly prevalent protozoan pathogens.
• To highlight infections relevant to immunocompromised individuals and global travelers.

Main Methods:

• Literature review of emerging and increasingly prevalent protozoan infections.
• Focus on infections with recent clinical or epidemiological relevance.
• Analysis of factors contributing to increased host susceptibility.

Main Results:

• Cryptosporidiosis and Cyclospora infections are of growing concern.
• Human microsporidiosis has emerged rapidly, linked to the AIDS pandemic.
• Isospora belli infections are increasingly recognized in HIV-infected hosts.

Conclusions:

• Protozoan infections pose a significant and growing challenge in clinical medicine.
• Increased global travel and immunosuppression contribute to the prevalence of these infections.
• Clinicians must be aware of these pathogens, particularly in immunocompromised populations.