Host defense mechanisms — components?
Physical barriers, chemical secretions, microbiota.
Skin as barrier — roles?
Physical, chemical, biological defenses.
Mucus role?
Traps bacteria, facilitates removal.
Chemical barriers — examples?
pH, lysozyme, antimicrobial peptides.
Microbiota — function?
Prevents pathogen colonization, supports immunity.
Virulence factors — types?
Adhesins, biofilms, enzymes, toxins, capsules.
Adhesins — purpose?
Facilitate bacterial attachment.
Biofilm formation — benefit?
Protection from immune system and antibiotics.
Bacterial enzymes — role?
Degrade host tissues, promote invasion.
Exotoxins — examples?
Neurotoxins, hemolysins, enterotoxins.
Capsule — function?
Inhibits phagocytosis, immune evasion.
Antigenic variation — purpose?
Avoid immune detection.
Host-bacteria — types?
Symbiosis, mutualism, parasitism, commensalism.
Microbiome — significance?
Supports health, digestion, immunity.
Infection stages — sequence?
Colonization, invasion, multiplication, dissemination.
Reservoirs — examples?
Humans, animals, environment.
Transmission modes — main types?
Direct, indirect, vector, fecal-oral.
Physical barriers — components?
Epidermis, keratin, desquamation, resident flora.
Inflammatory response — signs?
Redness, heat, swelling, pain, loss of function.
CRP, procalcitonin — role?
Markers of systemic inflammation.
Sepsis — definition?
Dysregulated systemic inflammatory response.
Bacterial invasion — mechanisms?
Cross barriers via enzymes, entry points.
Infection outcome — depends on?
Virulence factors and host defenses.
Bacterial survival — inside cells?
Phagosome inhibition, cytoplasmic escape.
Teste tes connaissances avec un QCM de 12 questions sur Host-Pathogen Dynamics and Defense Strategies.
1. What are host defense mechanisms primarily considered to be?
2. Who is the author cited in the course content as a source for bacterial virulence factors?
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