Microbiology, Acinetobacter baumannii, Acinetobacter, Bacteremia and Internal medicine are his primary areas of study. Harald Seifert combines subjects such as Plasmid and Gene with his study of Microbiology. His Acinetobacter baumannii study combines topics from a wide range of disciplines, such as Outbreak and Imipenem.

Harald Seifert has included themes like Multiple drug resistance, Genome, Species level and Polymerase chain reaction in his Acinetobacter study. His Internal medicine research includes themes of Antibiotics, Antibiotic resistance and Surgery. His research in Antibacterial agent intersects with topics in Enterococcus faecalis and Vancomycin.