London School of Hygiene & Tropical Medicine

This module builds on the Principles of Biology module and introduces students to pathogens, specifically how they interact with the human host to cause infection and disease. Students are also introduced to the concept of how knowledge of the biology can be used to avoid infection and reduce the global burden of communicable diseases.

The overall module aim is to introduce students to the way pathogens (viruses, bacteria, fungi, protozoa, helminths) invade, establish infection, cause disease and evade the immune response in the human host.

Intended learning outcomes

Upon successful completion of the module a student will be able to: 

1. Demonstrate a conceptual understanding of the different relationships that exist between pathogens and their human hosts.
2. Effectively communicate how the host responds to infections and how pathogens cause disease, demonstrating a critical awareness of pathogens that cause important communicable diseases in humans.
3. Communicate an understanding of the concept of vectors with particular reference to insects and acarines, with a critical awareness of examples of the globally important transmitted pathogens.
4. Critically evaluate how knowledge of the relationship between pathogens, vectors and their hosts can be used to reduce the global burden of communicable diseases.

Assessment

This module is assessed by a 3,000 word Time Limited Assessment.

Mode of delivery

Our distance learning modules are delivered entirely online via directed self-study and online materials via the Virtual Learning Environment.

Module duration

Distance learning module studies begin at the start of October each year. Students may start their studies at any time once they gain access to Moodle (the virtual learning environment) and study materials, and work through the materials in line with the assessment schedules. The study year runs from the beginning of October through to June examinations. Some students also study between June and September with extended tutorial support (e.g. those undertaking projects, the Clinical Trials integrating report, or two of the Epidemiology modules). Deadlines for submission of coursework vary per programme but are usually in February, March, May, and September.

How you'll study

Our distance learning programmes are predominantly online and largely self-directed study to enable you to study independently and at times convenient to you. You'll have access to tutorial support and the ability to interact with other students and form study groups throughout the study year via the discussions in our Virtual Learning Environment, Moodle.

Credits

• CATS: 15
• ECTS: 7.5

Module specification

For full information regarding this module please see the module specification.

Please note: information based on the 2025-26 module specification subject to change for 2026-27 entry.