15.2 Infectious Diseases & Fevers

Fever as an Exam Language

AIAPGET infectious-disease items usually encode a fever pattern plus a few characteristic concomitants. Before naming a remedy, classify the fever:

Always note onset, chill–heat–sweat sequence, prostration, rash, bleeding, relative bradycardia, and sensorium.

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Malaria

Plasmodium infection presents with periodic febrile paroxysms — chill, high fever, then sweating — with anaemia, splenomegaly, and in falciparum severe complications (cerebral malaria, blackwater fever, ARDS).

Homoeopathic high-yield:

• China (Cinchona officinalis) — periodicity, great debility from loss of fluids, anaemia, bloating, and hypersensitivity; the classic intermittent-fever / post-malarial weakness remedy in teaching banks
• Arsenicum album — periodic fever with profound restlessness, anxiety, burning thirst for small sips, and worse after midnight
• Natrum muriaticum — chronic intermittent fever with emaciation, mapped tongue, and worse in the sun / at seashore in some pictures; often after suppressed malaria history in older literature
• Eupatorium perfoliatum — bone-breaking pains with intense chill and thirst; “as if bones would break”
• Nux vomica — chilliness, irritability, gastric derangement, and worse morning in selected febrile states

Modern management of falciparum malaria is a medical emergency; exam answers still expect China / Arsenicum differentials when the stem is written in classical keynote language.

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Enteric Fever (Typhoid)

Salmonella Typhi causes stepwise fever, relative bradycardia, abdominal discomfort, rose spots, and risk of intestinal haemorrhage / perforation in the third week. Sensorium may dull; tongue is often coated with a red tip/edges in classic descriptions.

Homoeopathic high-yield:

• Baptisia tinctoria — the typhoid remedy par excellence: dusky / besotted face, stupor, falls asleep while answering, offensive putrid discharges, and a sense that the body is scattered; confusion and putridity dominate
• Pyrogenium — septic fever where pulse is out of proportion to temperature (rapid pulse with relatively lower recorded fever, or the reverse dissociation taught in materia medica), bed feels hard, offensive sweat, and restlessness; “blood poisoning” keynote
• Bryonia — slow onset, dry mucous membranes, wants to lie still, worse motion, white tongue — early dry typhoid-like stage in some differentials
• Rhus toxicodendron — restlessness, better motion, triangular red tip of tongue, and typhoid with muscular aching
• Arsenicum album — anxious restlessness, burning, offensive diarrhoea, and collapse tendency
• Muriatic acid — profound typhoid prostration with sliding down in bed and weak sphincter control in severe pictures

Baptisia vs Rhus vs Bryonia: Baptisia = stupid, putrid, dusky; Bryonia = still, dry, irritable to motion; Rhus = restless, better motion, aching.

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Dengue & Arboviral Fevers

Dengue presents with high fever, severe myalgia / arthralgia (“break-bone”), retro-orbital pain, rash, and thrombocytopenia. Watch for warning signs (severe abdominal pain, persistent vomiting, bleeding, plasma leakage, shock). Homoeopathy may be discussed for supportive febrile stages; haemorrhage and shock need urgent conventional care.

Remedies often listed in Indian PG banks:

• Eupatorium perfoliatum — bone pains with fever
• Rhus toxicodendron — aching restlessness
• Gelsemium — drowsy, trembling, heavy eyelids, little thirst
• China — weakness after fluids / blood loss tendency
• Phosphorus — haemorrhagic tendency with thirst for cold drinks when totality matches
• Crotalus / other snake remedies — when haemorrhagic sepsis colour dominates (recognize differentials; do not invent)

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Tuberculosis & Prolonged Fevers

Pulmonary TB: evening rise of temperature, night sweats, weight loss, chronic cough, haemoptysis. Extrapulmonary forms expand the differential. Public-health rules (notification, ATT regimens) sit outside remedy selection but appear as community-medicine crossover facts.

Homoeopathic constitutional / organotropic names frequently tested:

• Tuberculinum — restless, changing symptoms, desire for open air, family / personal TB history colouring the case
• Phosphorus — tall thin build, burning chest pains, haemorrhagic tendency, anxiety
• Calcarea carbonica — chilly, sweaty head, susceptibility
• Silicea — cold, sweaty feet, suppuration tendency, and fistulous / glandular sequelae
• Stannum — empty weak chest with expectoration that tastes sweet in some keynotes

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Cross-Cutting Septic Remedies

Memorize this exam quartet:

1. Baptisia — putrid typhoid stupor
2. Pyrogen — septic, pulse–temperature mismatch, offensive
3. China — intermittent / loss-of-fluids debility
4. Arsenicum — anxious, restless, burning, periodical or septic collapse

Add Rhus, Bryonia, Gelsemium, and Eupatorium for early viral / myalgic febrile stages. When a stem mentions “besotted face, answers and falls asleep, putrid stool,” Baptisia should light up before you overthink malaria periodicity.

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Rapid Differential Drill (Fever + Remedy)

Use this one-minute checklist on every febrile MCQ:

1. Periodicity present? → malaria lane (China, Arsenicum, Natrum mur., Eupatorium)
2. Stupor + putridity? → Baptisia first; severe septic mismatch → Pyrogen
3. Dry, still, worse motion? → Bryonia early febrile stage
4. Aching + must move? → Rhus toxicodendron
5. Drowsy, trembling, thirstless? → Gelsemium (viral / influenza-like)
6. Evening rises + night sweat + weight loss? → TB context (Tuberculinum / Phosphorus constitutional colour)

Community-medicine crossover facts that sometimes share a stem: smear microscopy / NAAT for TB, dengue NS1 / IgM timing, and malaria antigen / smear. You are not asked to run a lab, but recognizing which disease the lab language implies prevents wrong remedy families.

Collapse hierarchy: Aconite for sudden fear-filled onset; Belladonna for intense dry heat with throbbing; neither replaces Baptisia once putrid typhoid sensorium is established. Keep stage of fever clear — early storm versus established septic stupor — and AIAPGET fever items become pattern matching rather than guesswork.

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Staging Fevers Like a Clinician

Write three timestamps on every fever stem:

1. Onset character — sudden with fear (Aconite lane) versus gradual with dry thirstless ache (Bryonia / Gelsemium lane)
2. Established picture — putrid stupor (Baptisia), septic pulse mismatch (Pyrogen), intermittent periodicity (China / Arsenicum / Eupatorium)
3. Complications language — haemorrhage / perforation week in typhoid, dengue warning signs, falciparum cerebral features, smear-positive TB chronicity

Candidates lose marks by staying in the onset remedy after the stem has clearly moved into a later septic or consumptive stage. The same patient can theoretically travel from Aconite-like onset to Bryonia dryness to Baptisia putridity across days — answer the stage shown, not the disease name alone.

Dengue safety reminder: severe abdominal pain, persistent vomiting, mucosal bleed, cold clammy skin, or restlessness with declining platelets is not a “pick Eupatorium” moment first — it is a warning-sign / referral stem. Homoeopathic myalgia remedies belong to uncomplicated febrile phases when the vignette stays there.