It might be thought that viruses as a class represent the ultimate in parasitism. Reliant as they are on their host cells to provide most of the machinery or replication. The Parvoviruses, show a still further degree of dependence .

3. • The Parvoviruses, show a still further degree of dependence .
smallest of all human viruses

4. • Densovirinae
• Parvovirinae
• Parvovirus
• Dependoviruses
• Erythrovirus
• Bocavirus

5. Genus Viruses Diseases
Erythrovirus B19 Erythema infectiosum, fetal
infection, Aplastic anemia
Parvovirus RAV-1 Possibly implicated in rheumatoid
arthritis
Bocavirus Newly discovered respiratory and
enteric virus
Dependovirus Adeno-associated(AAV) types 1-5 AAV-2 possibly implicated in fetal
infections

7. • Erythema infectiosum
• Fetal infection
• Aplastic crisis

8. • Infectious rash is sometimes known as (fifth disease).
• Slapped cheek syndrome

10. teratogenic
hydrops fetalis
transfusion of the fetus with
concentrated erythrocytes.

11. Aplastic crisis(anemia)
• In chronic hemolytic anemia patients (SCA or thalassemia),
parvovirus infection may precipitate an aplastic crisis with very low
Hb and disappearance of circulating reticulocytes
fatal