Immunity acquired
Pro Research Analysisby 
Searched over 200M research papers for "immunity acquired"
Understanding Acquired Immunity: Insights from Recent Research
Natural Acquired Immunity Against HPV
Natural Immunity in Females vs. Males
Research has shown that naturally acquired antibodies against human papillomavirus (HPV) can provide significant protection against subsequent infections, particularly in females. A systematic review and meta-analysis involving over 24,000 individuals from 18 countries found that females with naturally acquired antibodies against HPV-16 and HPV-18 had a reduced risk of subsequent infection (pooled relative risk (RR) of 0.65 and 0.70, respectively) . However, this protective effect was not observed in males, indicating a gender-specific response to natural immunity against HPV .
Type-Specific Protection
The study also highlighted type-specific protection against a combined measure of other HPV types (HPV-6/11/31/33/35/45/52/58) in females, with a pooled RR of 0.75 . This suggests that natural immunity can be effective against a broad range of HPV types, although the degree of protection varies.
Innate Immunity's Role in Acquired Immune Response
Innate Immunity as a Determinant
Innate immunity, traditionally seen as a rapid but incomplete defense mechanism, plays a crucial role in shaping the acquired immune response. It helps determine which antigens the acquired immune system will respond to and influences the nature of that response . Understanding the molecules and pathways involved in this process could lead to new therapeutic options for infectious and autoimmune diseases .
Protection Against Hepatitis E Virus (HEV)
Effectiveness of Natural and Vaccine-Induced Immunity
A study on hepatitis E virus (HEV) demonstrated that both naturally acquired and vaccine-induced immunity significantly reduce the risk of infection. Participants with pre-existing immunity had a lower risk of infection (0.52%) compared to those who were seronegative (2.04%) . This indicates that natural immunity, similar to vaccine-induced immunity, can effectively protect against HEV infection .
Trade-offs Between Innate and Acquired Immunity
Cost and Effectiveness
The balance between innate and acquired immunity is influenced by developmental and environmental factors. Innate immunity, which is quick to mobilize and effective against novel pathogens, has lower developmental costs but higher operating costs. In contrast, acquired immunity, which is more effective against secondary exposures due to immunological memory, has higher developmental costs but lower maintenance costs . This balance is optimized based on local ecological conditions, such as nutritional abundance and pathogen exposure .
Acquired Immunity to Malaria
Gradual Acquisition and Effectiveness
Naturally acquired immunity to malaria, particularly against Plasmodium falciparum, is highly effective in preventing severe disease and death among individuals routinely exposed to the parasite. However, the rate of onset and the mechanisms of this immunity are not well understood. Studies suggest that immunity is acquired gradually with increasing exposure, and physiological changes with age may influence the symptoms of the disease 79. Understanding these mechanisms could help replicate this protection in high-risk populations, such as infants in endemic areas .
Non-Specific Aspects of Acquired Immunity
Cross-Protection and Microbiota Influence
Acquired immunity is not always highly specific to the antigens of encountered pathogens. Past infections, vaccinations, and chronic infections can induce cross-protection against various pathogens. This non-specific protection can be influenced by the poly-specificity of antigenic receptors and the composition of the microbiota, which can modulate the immune response . This emerging paradigm suggests that a significant part of acquired immunity in nature may be non-specific, offering broader protection against rapidly evolving pathogens .
Conclusion
Recent research highlights the complexity and variability of acquired immunity. Natural immunity against HPV and HEV shows significant protective effects, particularly in females and individuals with pre-existing immunity. The interplay between innate and acquired immunity, influenced by developmental and environmental factors, underscores the need for a nuanced understanding of immune responses. Additionally, the non-specific aspects of acquired immunity and the role of microbiota offer new perspectives on disease resistance and therapeutic strategies. Understanding these mechanisms is crucial for developing effective interventions against infectious diseases.
Sources and full results
Most relevant research papers on this topic
Natural Acquired Immunity Against Subsequent Genital Human Papillomavirus Infection: A Systematic Review and Meta-analysis.
Natural HPV antibodies acquired through natural infection provide modest protection against subsequent cervical HPV infection in female subjects.
The Instructive Role of Innate Immunity in the Acquired Immune Response
Innate immunity plays a crucial role in determining which antigens the acquired immune system responds to, potentially offering new therapeutic options for infectious and autoimmune diseases.
Protection against hepatitis E virus infection by naturally acquired and vaccine-induced immunity.
Both vaccine-induced and naturally acquired immunity effectively protect against hepatitis E virus infection.
DOI