27 - Infectious Diseases 2 Flashcards
How does malaria present in children?
ALWAYS CHECK TRAVEL HISTORY
- Drowsiness
- Irritability
- Poor feeding
- Fever
- Splenomegaly
- Jaundiced
- Seizures
- Chills, fever, sweating cycling every 2-3 days
What organism causes malaria and when do children present?
- Plasmodium Falciparum (75%)
- Plasmodium Vivax
Most present within the first month, if not up to 6 months
What are some signs of severe malaria?
What investigations are done to diagnose malaria in children?
- Thick and thin films: if initial test negative but suspected, film needs to be repeated up to 3 times (12, 24 and 48 hours)
- Rapid antigen tests
- Bloods:
- FBC
- Blood glucose rapid test and laboratory sample blood gas
- U+Es, LFTs, CRP, Clotting screen
- Blood cultures
- G6PD if primaquine is required
What investigations are done to diagnose malaria in children?
- Thick and thin films: if initial test negative but suspected, film needs to be repeated up to 3 times (12, 24 and 48 hours)
- Rapid antigen tests
- Bloods:
- FBC
- Blood glucose rapid test and laboratory sample blood gas
- U+Es, LFTs, CRP, Clotting screen
- Blood cultures
- G6PD if primaquine is required
How are all children with malaria regardless of cause and severity managed?
- Inform public health
- Admit to hospital for 24h for
How is complicated malaria in children managed?
- Admit to HDU/PICU
- IV artesunate for 24 hours
- Then a full course of oral Artemether- lumefantrine when can tolerate
- Hourly observations including neuro in first 12 hours as risk of rapid deterioration
How is uncomplicated falciparum malaria treated in children?
Can be outpatient
First line: Artemether-lumifantrine or DHA-PPQ (Dihydroartemisinin-piperaquine).
- Quinine with doxycycline or Atovaquone-proguanil can also be used
How is uncomplicated non-falciparum malaria treated?
Chloroquine or Primaquine
Always check G6PD
How is a pregnant woman with malaria treated?
If neonate infected will present like neonatal sepsis
C, E, B
Always be thinking TB and malignancy
What are contraindications to vaccination?
- Previous anaphylaxis to a vaccine or vaccine component (
- Primary or acquired immunodeficiency
- Immunosuppressive therapy. e.g. chemotherapy or radiotherapy, high-dose steroids).
Temporary deferral:
- Acutely unwell e.g. with fever >38.5°C. Postpone immunisation until well.
- Immunoglobulin therapy
A and C
C is DiGeorge syndrome so immunosuppressed
Which vaccines in the routine immunisation schedule are live?
- MMR
- Rotavirus
- Nasal flu
What are the different types of adverse events following immunisation? (AEFI)
- Programme-related e.g. wrong dose, vaccine inappropriately prepared, vaccine stored incorrectly.
- Vaccine-induced Reactions in individuals to a particular vaccine
- Coincidental. Not a true AEFI but only linked because of the timing of the occurrence
- Unknown
What are some reasons for under vaccination?
- Vaccine hesitancy/refusal
- Children in large families
- Children with lone or single parents
- Looked after children
- Children in mobile families
- Migrant/asylum seeking children
- Children with disabling or chronic conditions
- Children in ethnic minority groups
What is toxic shock syndrome and what is it caused by?
Acute, multi-system inflammatory response to an exotoxin-mediated bacterial infection
Life-threatening with rapid progression to septic shock
Common pathogens: Staphylococcus aureus and Group A Streptococcus (GAS; S pyogenes)
What are some risk factors for toxic shock syndrome in children?
Always consider in burns!!!!!
Usually small surface area burn presenting 2 days after burn
What is the centre for disease control and prevention diagnostic criteria for TSS?
Fever, Hypotension, Rash
PLUS
3 or more organ systems involved
Why are children more susceptible to severe toxic shock syndrome?
- Immature immune systems that cannot produce antitoxin antibodies
- Infants under 1 are protected by passive immunity at birth and in breast milk
- Small burns worse as less aggressively treated
When should you suspect toxic shock syndrome?
An unwell child with a burn or other risk factors is TSS until proven otherwise
Similar presentation to sepsis, multi system involvement
What are some non-specific signs of TSS?
- High fever ≥38.9
- Tachycardia
- Tachypnoea
- Capillary refill >3 seconds
How is toxic shock syndrome managed acutely?
Same as sepsis!!!
- High flow oxygen
- Obtain IV/IO Access
- Obtain bloods
- Empirical sepsis antibiotics plus IV clindamycin
- Consier fluid resuscitation: fluid bolus: 10-20ml/kg saline over 5-10 mins, beware fluid overload (crepitations, gallop rhythm, hepatomegaly) Consider catheterisation
- Observe minimum every 15-30 minutes
- Analgesia
- Gentle clean and dressing of wound, take wound swabs for MC+S
- Refer to Paediatrics, (Plastic Surgery if burns/skin loss), PICU, Microbiology
What are empirical antibiotics for TSS once microbiology results are back?
If not improving give Fresh Frozen Plasma and IVIG
What is the most common cause of neonatal encephalitis?
Herpes Simplex Virus
Can present up to 4 weeks after delivery, give IV aciclovir if mother infected with vulval herpes
That is why shouldn’t kiss newborns
What do investigations show with herpes simplex encephalitis?
Temporal changes on CT
How does Herpes Simplex tend to present in children?
- Gums
- Lips
- Eyes
- Genitals
What is chicken pox caused by and how does it present?
Varicella Zoster Virus
- Prodrome: Fever is often the first symptom, fatigue and malaise
- Vesicular rash: starting papular on trunk or face and spreading outwards
- Lesions scab over
What is the management of chicken pox in children?
- Encourage fluids and give paracetamol
- Trim nails
- Calamine lotion
- School exclusion until crusted over
- Immunocompromised patients and Newborns need varicella zoster immunoglobulin (VZIG). If chickenpox develops then give IV aciclovir
What are some rare complications of chicken pox?
- Bacterial superinfection: AVOID NSAIDs
- Pneumonia
- Encephalitis (cerebellar involvement may be seen)
- Disseminated haemorrhagic chickenpox
- Arthritis, nephritis and pancreatitis
What are the five types of nappy rash?
- Irritant/Ammonia dermatitis
- Candida
- Seborrhoeic dermatitis
- Psoriasis
- Atopic eczema
How does candidate nappy rash occur?
Erythematous rash which involve the flexures and has characteristic satellite lesions
- Rash extending into skin folds
- Larger red macules
- Well demarcated scaly border
- Circular pattern to the rash spreading outwards, similar to ringworm
- Satellite lesions
- May have oral thrush, check tongue
How is candidal nappy rash managed?
- Clotrimazole +/- Hydrocortisone depending on severity
- Use highly absorbent disposable nappies not towel
- Change nappy as soon as possible
- Expose napkin area to air when possible
- DO NOT use barrier preparation like sudocrem
How should cellulitis in children be managed?
- Take a swab if high risk
- Draw around area of redness
- Antibacterial
- Manage any underlying condition that may predispose to cellulitis e.g diabetes, venous insufficiency, eczema, oedema
- Reassess if not improving in 2-3 days of antibacterial or if spreading/pain out of proportion
What children need hospital admission for IV antibiotics for cellulitis?
- Under 1
- Orbital cellulitis
- Osteomyelitis
- Septic arthritis
- Necrotising fasciitis
- Sepsis
What antibacterial is used for the following conjunctivitis:
- Purulent
- Chalmydial
- Conjunctival
What are the different types of conjunctivitis in children?
- Allergic
- Viral
- Bacterial
What is influenza caused by and how does it present?
- Highly infectious caused by influenza viruses types (A, B, and C)
- Influenza A more virulent and occurs more frequently; Influenza B is milder; and influenza C causes mild or asymptomatic disease, similar to common cold
- Symptoms usually appear suddenly: chills, fever, headache, extreme fatigue, myalgia, dry cough, sore throat and nasal congestion
How is influenza managed?
- If simple treat at home supportively
- If high risk give Oseltamivir or Inhaled Zanamivir within 48 hours of symptom onset
When do influenza vaccines take place and which children are eligible for them?
Late September to Late November
- Children 6months or over who are high risk
- All children aged 2–15 years
- Children living in long-stay residential homes
- Household contacts of immunocompromised individuals
When are children offered the BCG vaccination?
How may TB present in children?
- Persistent cough
- Weight loss and night sweats
- Fever
- Persistent oral candida
- Persistent UTIs
- Widespread lymphadenopathy
- Hepatosplenomegaly
- Failure to thrive
- Developmental delay
How is active TB diagnosed?
Screened
- Mantoux (affected by BCG)
- Interferon GRA (not affected by BCG but cannot tell active from latent)
Diagnosis
- CXR
- 3 x Sputum Smear
- Sputum culture (gold standard)
- NAAT
How is latent TB in children managed?
Neonates: If contact, give Isoniazid (with pyridoxine hydrochloride) followed by a Mantoux test after 6 weeks of treatment. If positive continue for 6 months, if negative stop and give BCG
4 weeks to 2 years: Close contact with a person with tuberculosis which has not been treated for at least two weeks, should start treatment for latent tuberculosis and have a Mantoux test. Either isoniazid (with pyridoxine hydrochloride) alone for 6 months or rifampicin and isoniazid (with pyridoxine hydrochloride) for 3 months
> 2 years: Mantoux test, and if positive (and active tuberculosis is not present), then treat as above for children aged 4 weeks to 2 years. If the test is negative, then offer an interferon-gamma release assay after 6 weeks and repeat the Mantoux test
What are the side effects of antiTB drugs?
When should you suspect gastroenteritis in children?
What is the most common cause of acute gastroenteritis in children and what is the biggest risk with this?
Rotavirus (also noro and adenovirus)
Risk of dehydration
Starts with vomiting then diarrhoea
What children are at increased risk of dehydration with gastroenteritis?
What are some red flag features of vomiting and diarrhoea that point away from simple gastroenteritis?
Differentials
- Systemic infection (UTI, pneumonia, meningitis, sepsis).
- Appendicitis, intussusception, bowel obstruction, Hirschsprung’s
- HUS
How do you assess dehydration in gastroenteritis?
What investigations are done for children presenting with gastroenteritis?
- BM
- If IV fluids being given check U+Es, VBG and glucose
How is acute gastroenteritis managed based on the level of dehydration?
(USE IMAGE)
REHYDRATION
No dehydration
- Consider giving 5 ml/kg of ORS (Dioralyte) or Apple juice after each large watery stool if at increased risk of dehydration
- Ondansetron
- Encourage breastfeeding, other milk feeds and fluid intake
- Give full strength milk straight away.
- Reintroduce child’s usual solid food
- Avoid fizzy drinks and fruit juices until diarrhoea has stopped
How do we prevent vertical HIV transmission from mother to child?
Avoid breastfeeding
At birth
Mode of delivery:
- Normal vaginal delivery if viral load < 50 copies / ml
- C section if > 50 copies copies / ml and in all women with > 400
- IV zidovudine during caesarean if viral load unknown or > 10000
Prophylaxis treatment to baby:
- Low risk babies (mums viral load is < 50): zidovudine for 4 weeks
- High risk babies (mums viral load is > 50 copies): zidovudine, lamivudine and nevirapine for 4 weeks
When and how do we test babies born from HIV positive mothers to see if they have caught it?
HIV PCR/Viral Load: birth, 3 months, 6 months
HIV Antibodies: done at 18-24 months as before mother’s antibodies still present
If both negative and mum is not breastfeeding then baby is HIV -ve
When should we test for HIV in children and what do we need to do before testing?
GAIN INFORMED CONSENT
- PUO
- Lymphadenopathy
- Hepatosplenomegaly
- Persistent diarrhoea
- Parotid enlargement
- Shingles
- Recurrent slow-to-clear infections
- Failure to thrive
- TB; pneumocystosis; toxoplasmosis; cryptococcosis; histoplasmosis;
How is paediatric HIV managed?
MDT Approach
- Antiretroviral therapy (ART): aim for normal CD4 and undetectable viral load
- Normal childhood vaccines, avoiding or delaying live vaccines
- Prophylactic co-trimoxazole (Septrin) for children with low CD4 counts, to protect against pneumocystis jirovecii pneumonia (PCP)
- Treatment of opportunistic infections
- Safe sex talk
Children can get Hep B via vertical transmission. What is the typical prognosis with this?
- Majority clear within 2 months
- Chronic Hep B: 5% will develop cirrhosis and 0.05% will develop hepatocellular carcinoma before adulthood
What do the following mean on Hep B testing:
HBsAg
HBeAg
HBcAb
HbSAb
(watch Z2F’s youtube)
- Surface antigen (HBsAg) – active infection
- E antigen (HBeAg) – implies high infectivity
- Core antibodies (HBcAb) – past or current infection
- Surface antibody (HBsAb) – vaccination, past or current infection
- Hepatitis B virus DNA (HBV DNA) – direct count of the viral load
When screening for Hep B infection what are you screening for and which children need Hep B screening?
(watch Z2F YouTube video)
- HBcAb (past infection if IgG, current it IgM)
- HBsAg (current infection)
If above are positive then test for HBeAg and HBDNA
What is PIMS?
Associated with COVID
Mimics Kawasaki and Toxic shock syndrome. KAWASHOCKI
How is PIMS-TS managed?
- IV methylprednisolone
- Aspirin for thrombosis prevention
- IV immunoglobulins
- Clindamycin cover
ALWAYS BE DOING ECHOCARDIOGRAMS
