Malaria life cycle microbiology flow chart photo
Reading File
Finding Sources
Searching the Web
malaria life cycle microbiology diagram flowchart Plasmodium
Finding Sources
Loading Image
Loading Image
Reading File
Loading Image
Here is a complete breakdown of the Malaria (Plasmodium) Life Cycle, with two visual diagrams retrieved from authoritative sources:
Life Cycle of Plasmodium (Malaria) - Flowchart
Diagram 1 - Overview (Human + Mosquito Hosts)
Diagram 2 - Erythrocytic Cycle Flowchart (Detailed)
Step-by-Step Life Cycle Summary
The malaria parasite (Plasmodium spp.) has a digenetic life cycle - two hosts are required:
| Host | Type | Phase |
|---|---|---|
| Female Anopheles mosquito | Definitive host | Sexual cycle (Sporogony) |
| Human | Intermediate host | Asexual cycle (Schizogony) |
Phase 1 - IN THE HUMAN HOST
A. Hepatic (Exo-erythrocytic) Schizogony - Liver Stage
- Infected female Anopheles mosquito bites human → injects ~3,000 sporozoites into bloodstream
- Sporozoites travel via blood to the liver (hepatocytes) within 30-60 minutes
- In liver cells: sporozoites undergo schizogony (asexual multiplication) → form liver schizonts
- Liver schizonts rupture after 8-25 days → release thousands of merozoites into blood
- (In P. vivax and P. ovale only): some sporozoites become dormant hypnozoites in the liver → cause relapses weeks to years later
B. Erythrocytic Schizogony - Blood Stage (causes clinical disease)
- Merozoites invade red blood cells (RBCs)
- Inside RBC: parasite develops in stages:
- Ring form / Early trophozoite (signet ring appearance)
- Late trophozoite (ameboid, with hemozoin pigment)
- Schizont (multiple merozoite nuclei forming)
- Schizont ruptures RBC → releases 8-32 new merozoites → invade fresh RBCs (cycle repeats every 48 hrs for P. falciparum, P. vivax, P. ovale; 72 hrs for P. malariae)
- RBC rupture = fever spikes (tertian or quartan fever pattern)
- Some merozoites differentiate into sexual forms: gametocytes (macro- = female; micro- = male)
Phase 2 - IN THE MOSQUITO HOST
C. Sporogony - Sexual Cycle
- Female Anopheles mosquito takes a blood meal → ingests gametocytes
- In the mosquito midgut:
- Macrogametocyte → macrogamete (female, non-motile)
- Microgametocyte → microgametes (flagellated, motile) via exflagellation
- Fertilization (syngamy) → forms zygote
- Zygote elongates → becomes motile ookinete
- Ookinete penetrates midgut wall → forms oocyst on outer surface
- Oocyst undergoes sporogony → matures into thousands of sporozoites
- Oocyst ruptures → sporozoites migrate to salivary glands
- Sporozoites injected into next human host during bite → cycle restarts
Species Differences
| Species | Fever Pattern | Cycle Duration | Special Features |
|---|---|---|---|
| P. falciparum | Irregular (then tertian) | 48 hrs | Most virulent; cerebral malaria; no hypnozoites |
| P. vivax | Tertian (every 48 hrs) | 48 hrs | Hypnozoites (relapses); Duffy antigen receptor |
| P. ovale | Tertian | 48 hrs | Hypnozoites (relapses) |
| P. malariae | Quartan (every 72 hrs) | 72 hrs | Can persist decades |
| P. knowlesi | Quotidian (24 hrs) | 24 hrs | Zoonosis (macaques) in SE Asia |
Key Terms
- Schizogony - asexual multiplication by multiple fission
- Sporogony - sexual multiplication in the mosquito
- Merozoite - invasive form that enters RBCs
- Sporozoite - infectious form injected by mosquito
- Hypnozoite - dormant liver stage (P. vivax, P. ovale only)
- Gametocyte - sexual form taken up by mosquito
Source: Tietz Textbook of Laboratory Medicine, 7th Edition; CDC DPDx Malaria
This is a shared conversation. Sign in to Orris to start your own chat.