Complex correlates of protection after vaccination

Area of Science:

• Immunology
• Vaccinology
• Pathogen Protection

Background:

• Prior research has aimed to simplify the understanding of vaccine-induced immunological functions correlating with protection.
• Established terminology distinguishes between antibody-mediated prevention of acquisition and cellular immune-mediated clearance of infection.
• The distinction between antibody and cellular functions in vaccine protection is often blurred due to complex immune responses.

Purpose of the Study:

• To explore the complexity of immune functions that contribute to vaccine-induced protection against pathogens.
• To move beyond simplistic explanations and detail the mechanistic immune functions involved in protection.
• To discuss non-mechanistic correlates of protection that are practically useful but not truly protective.

Main Methods:

• Analysis of existing literature on immunological functions induced by vaccination.
• Review of proposed terminology for semantic clarity in the field.
• Discussion of specific and redundant antibody and cellular responses.

Main Results:

• The generalization that antibodies prevent acquisition and cellular immunity clears infection holds but is often oversimplified.
• Vaccine-induced protection can involve multiple, redundant immune functions, not just a single mechanism.
• Specific antibody and cellular responses are diverse and interact in complex ways to confer protection.

Conclusions:

• Understanding vaccine-induced protection requires appreciating the complexity of multiple, interacting immune functions.
• Vaccines can protect through a combination of immunological mechanisms, challenging simple distinctions.
• Further research is needed to fully elucidate the intricate interplay of immune functions in vaccine efficacy.