Core Microbiology - Childhood Viral Infections (6) Flashcards
Notifiable diseases
- Acute meningitis
- Acute poliomyelitis
- Measles
- Mumps
- Rubella
- Smallpox
Notifiable diseases
- Acute meningitis
- Acute poliomyelitis
- Measles
- Mumps
- Rubella
- Smallpox
IgM produced
In acute infection
IgG produced
In long term immunity
IgA produced
In breast milk - maternal antibody
Child with a rash
Parvovirus, measles, Chickenpox, Rubella, Non-polio enterovirus infection, EBV (ampicillin), Staph. aureus, N. meningitidis
What virus causes measles?
Paramyxovirus (enveloped single stranded RNA virus)
Measles transmission
Person to person, droplet spread
Measles infectivity
From start of first symptoms - 4 days before rash > 4 days after rash
Measles incubation
7-18 days (average 10-12)
Measles natural host
Only humans
Clinical features of measles - 3 C’s
Conjunctivits, coryza (rhinitis) and cough
Clinical features of measles
Fever, malaise, conjunctivitis, coryza, cough, rash (eryhematous, macuopapular, head and trunk), Koplik’s spots (1-2 days before rash - mouth)
Complications of measles
Otitis media, pneumonia, diarrhoea, acute encephalitis
Rare complications of measles
Subacute sclerosing panencephalitis (SSPE) - brain disorder - fatal
Death in measles
Highest in
Diagnosis of measles
Clinical, leukopenia, oral fluid sample, serology
Prevention of measles
Live MMR vaccine - 1 year/pre-school, human normal, Ig
Chicken pox virus
Varicella Zoster virus/Herpes virus (DNA)
Transmission of chicken pox
Respiratory spread/personal contact (15 mins)
Incubation period of chicken pox
14-15 days
Infectivity of chicken pox
2 days before onset of rash until after vesicles dry up
Clinical features of chicken pox
Fever, malaise, anorexia, rash
Chicken pox rash
Centripetal (trunk and face)
Macular > papular > vesicular > pustular
Complications of chicken pox
Pneumonitis (risk increased for smoker), CNS involvement, thrombocytopenic purpura, foetal varicella syndrome, congenital varicella, zoster
Diagnosis of chicken pox
Clinical/PCR - vesicle fluid/CSF
Serology of chicken pox
Immunity, IgG in pregnant women
Treatment of chicken pox
Aciclovir and cholrpheiramine (relieve itch)
Who gets treatment for chicken pox?
Symptomatic adults and immunocompromised children
Prevention of chicken pox
Live vaccine (USA/Japan), VZ immunoglobulin (VZIG)
Rubella (the third disease) virus
Togavirus, RNA virus
Rubella Transmission
Droplet spread (air-bourne), less contagious
Incubation period Rubella
14-21 days
Clinical features of Rubella
Lymphadenopathy (post-auricular, suboccipital), rash, fever, tiredness, aching joints (50% asymptomatic)
Rubella rash
Non-specific, erythematous, behind ears and face and neck
Complications of Rubella
Thrombocytopenia, post infectious encephalitis, arthritis
Rubella in pregnancy/Congenital Rubella syndrome (CRS)
Cataracts, deafness, cardiac abnormalities, microcephaly, retardation of intra-uterine growth, inflammatory lesions of brain, liver, lungs and bone marrow
Diagnosis of Rubella
Oral fluid testing/serology (IgM/G)
Prevention
- Ig given to pregnant exposed women
- Vaccine (MMR)
Erythema infectiosum/slapped cheek/fifth disease virus
Parvovirus B19 (DNA)
Transmission of Erythema infectiosum
Respiratory secretions, mother > child
Erythema infectiosum incubation period
4-14 days
Erythema infectiosum clinical
Minor respiratory, rash (slapped cheek), arthralgia, aplastic anaemia (20% asymptomatic)
Erythema infectiosum foetal presentation
Anaemia and hydrops (accumulation of fluid)
Diagnosis of Parvovirus
Serology IgM/G, amniotic fluid sampling, PCR (immunocompromised)
Treatment of Erythema infectiosum
None/blood transfusion
Enteroviral infections
Coxsackie, entero, echoviral infections
Prevalence of enteroviral infections
In under 5s
Enteroviral infections transmission
Faecal-oral and skin contact
Enteroviral infections clinical presentation
90% asymptomatic, hand, foot and mouth rash, meningitis
Child with respiratory symptoms
- Respiratory Syncytial Virus
- Parainfluenza
- Influenza
- Adenovirus
- Metapneumovirus
- Rhinovirus
RSV virus
Pneumovirus
RSV bronchiolitis
RSV diagnosis
PCR - secretions from nasopharyngeal aspirate
RSV treatment
O2, manage fever and fluid intake, Palivizumab - Ig/monoclonal abs
Metapneumovirus virus
Paramyoxvirus
Metapneumovirus age
5 yrs
Metapneumovirus clinical
Similar RSV, mild upper respiratory tract infection > pnuemonia
Metapneumovirus diagnosis
PCR
Adenovirus incidence
10% childhood respiratory infection
Adenovirus clinical presentation
Mild URTI, conjunctivitis, diarrhoea
Adenovirus diagnosis
PCR (eye swab/resp), serology
Adenovirus treatment
Cidofovir for immunocomproised
Parainfluenza virus
Paramyxovirus (4 types)
Parainfluenza transmission
Person to person - inhalation
Parainfluenza clinical presentation
Croup, bronchiolitis, URTI
Parainfluenza diagnosis
Multiplexed PCR
Common cold
Rhinovirus
Child with diarrhoea
Rotavirus or Norovirus
Rotavirus virus
Reovirus (RNA)
Rotavirus tranmission
Facecal-oral (respiratory), low infective dose
Rotavirus incubation period
1-2 days