Gonorrhea

GONORRHEA – COMPLETE NOTES

1. Introduction

• Gonorrhea is a sexually transmitted infection (STI) caused by
  Neisseria gonorrhoeae
• Gram-negative, non-motile diplococcus
• Affects warm, moist mucosal surfaces:
• Genital tract
• Rectum
• Oropharynx
• Eyes

2. Incubation Period

• 1–14 days
• Symptoms appear:
• Men: 2–8 days
• Women: ~10 days (often asymptomatic early)

3. Sites of Infection

Men

• Urethra (most common)
• Rectum
• Oropharynx

Women

• Endocervix (most common)
• Urethra
• Rectum
• Oropharynx
• Eyes

4. Clinical Features

A. In Men

Symptoms

• Urethral discharge:
• Initially clear/milky → yellow, creamy, purulent
• May be blood-tinged
• Dysuria (painful urination)
• Frequency of urination
• Anal symptoms:
• Itching, discharge, bleeding
• Rare:
• Sore throat
• Conjunctivitis

Complications

• Epididymitis
• Prostatitis
• Urethral stricture
• Inguinal lymphadenopathy

B. In Women

(Often asymptomatic → higher risk of complications)

Symptoms

• Dysuria
• Abnormal vaginal discharge
• Intermenstrual or postcoital bleeding
• Lower abdominal pain
• Dyspareunia (painful intercourse)
• Anal itching/discharge
• Fever, malaise
• Bartholin gland swelling

Complications

• Pelvic Inflammatory Disease (PID)
• Infertility
• Ectopic pregnancy

5. Pathophysiology

• Organism attaches to mucosal epithelium via pili
• Invades epithelial cells → inflammation
• Neutrophil infiltration → purulent discharge

6. Diagnosis

Laboratory Tests

1.     Culture (Gold standard)

• Medium: Thayer-Martin agar
• CO₂ incubation required

2.     Gram Stain

• Men: Gram-negative intracellular diplococci in urethral smear
• Women: Less sensitive → culture preferred

3.     NAAT (PCR / LCR)

• Highly sensitive and specific
• Detects genetic material

7. Treatment

A. Non-Pharmacological

• Avoid sexual contact during treatment
• Treat all sexual partners
• Use condoms

B. Pharmacological (Current Standard Concept)

(Important: older regimens in your text updated for accuracy)

First-line

• Ceftriaxone IM (single dose)
  +
• Azithromycin (single oral dose)
  (or doxycycline if Chlamydia suspected)

Alternative

• Cefixime (if ceftriaxone unavailable)

Cephalosporin Allergy

• High-dose azithromycin (less preferred now)

Disseminated Infection

• IV ceftriaxone → followed by oral therapy

Neonatal Prophylaxis

• Erythromycin eye ointment at birth
• For infection: ceftriaxone (dose adjusted by weight)

8. Counseling Points

• Use condoms consistently
• Avoid multiple partners
• Complete full antibiotic course
• Screen for other STIs:
• HIV
• Hepatitis B
• Syphilis
• Educate about:
• Pregnancy risk
• Emotional and social aspects

9. Prevention

• Safe sex practices
• Abstain until treatment completed
• Test and treat all partners
• Follow-up testing to confirm cure

Exam Tips (Very Important)

• Gram-negative diplococci inside neutrophils → Gonorrhea
• Most common site:
• Men → urethra
• Women → cervix
• Major complication in females → PID
• Drug of choice → Ceftriaxone

 

🥗 BALANCED DIET

1. Introduction

• Nutrition: Intake of food according to body requirements.
• Good nutrition = Balanced diet + regular physical activity.
• It is essential for:
• Growth and development
• Immunity
• Prevention of diseases

⚠️ Poor nutrition leads to:

• Low immunity
• Increased infections
• Poor physical & mental growth
• Reduced productivity

2. Definition of Balanced Diet

A balanced diet is one that provides:

• All essential nutrients
• In correct proportions
• Adequate energy for daily activities

3. Composition of Balanced Diet

A balanced diet includes:

• Carbohydrates → ~50% (main energy source)
• Fats → ~25–30% (energy + essential fatty acids)
• Proteins → ~10–15% (growth & repair)
• Vitamins & Minerals → small amounts (regulatory functions)
• Water → essential for all body processes

4. Objectives of Balanced Diet

• Maintain good health
• Provide adequate energy
• Support growth and tissue repair
• Prevent nutritional deficiencies
• Maintain ideal body weight

5. WHO Recommendations for Healthy Diet

From World Health Organization:

1. Maintain energy balance (calories in = calories out)
2. Increase fruits, vegetables, legumes, whole grains, nuts
3. Limit fat intake
• Avoid saturated & trans fats
• Prefer unsaturated fats
4. Limit sugar intake
5. Reduce salt intake and use iodized salt

6. Additional Dietary Recommendations

✅ Proteins

• Sources: Meat, fish, eggs, milk, pulses, soybeans
• Vegetarians can combine:
• Cereals + pulses → complete protein

✅ Micronutrients

• Obtain from:
• Fruits
• Vegetables
• Nuts

7. Healthy Diet Concept

A healthy diet:

• Provides essential nutrients
• Prevents:
• Obesity
• Type 2 diabetes
• Hypertension
• Heart disease
• Cancer

8. Important Practical Guidelines

🍞 Carbohydrates

• Prefer whole grains
• Avoid refined foods (white bread, pastries)

🥩 Proteins

• Choose fish, poultry, legumes
• Limit red meat

🥑 Fats

• Prefer plant oils, nuts, fish
• Avoid trans fats

🥦 Fruits & Vegetables

• Eat variety and color
• At least 2–5 servings/day

🧂 Salt

• Limit intake
• Avoid processed foods

🍬 Sugar

• Keep <10% of total calories

💧 Fluids

• Water is best
• Limit sugary drinks

☀️ Others

• Regular physical activity
• Avoid contaminated/unsafe foods

9. Key Takeaway (Exam Point)

👉 Balanced diet = Right nutrients + Right quantity + Right proportion

 

AIDS

 

ACQUIRED IMMUNODEFICIENCY SYNDROME (AIDS)

INTRODUCTION

• AIDS is a chronic, life-threatening condition caused by the Human Immunodeficiency Virus (HIV).
• HIV damages the immune system, especially CD4+ T lymphocytes, reducing the body’s ability to fight infections.
• It is primarily a sexually transmitted infection (STI) but can also spread via blood and from mother to child.
• Without treatment, HIV progresses to AIDS over several years.
• No cure exists, but Antiretroviral Therapy (ART) can control the disease and prolong life.

SYMPTOMS

1. Primary Infection (Acute HIV)

Occurs 2–4 weeks after infection.

Symptoms:

• Fever
• Headache
• Muscle and joint pain
• Rash
• Sore throat
• Painful mouth ulcers
• Swollen lymph nodes

👉 High viral load → highly infectious stage

2. Clinical Latent Stage (Chronic HIV)

• Usually asymptomatic
• May last ~10 years without treatment (longer with ART)

Features:

• Persistent lymphadenopathy
• Virus remains active in lymphoid tissues

3. Symptomatic HIV Infection

Symptoms:

• Fever
• Fatigue
• Chronic diarrhea
• Weight loss
• Oral candidiasis (thrush)
• Herpes zoster (shingles)
• Persistent lymph node enlargement

4. AIDS (Advanced Stage)

Features:

• Severe immunosuppression (CD4 < 200 cells/mm³)
• Opportunistic infections & cancers

Symptoms:

• Night sweats
• Chronic diarrhea
• Persistent fever
• Severe weight loss
• Oral lesions
• Skin rashes

PATHOGENESIS

1.     Entry & Replication

• HIV enters bloodstream → rapid viral replication
• High viral load in early phase

2.     CD4+ T Cell Depletion

• Acute phase:
• Viral destruction + cytotoxic T cell killing
• Chronic phase:
• Immune activation + reduced T cell production

3.     Immune Response

• CD8+ T cells control viral load partially
• Antibodies formed but do not eliminate virus

4.     Mucosal Damage

• Massive loss of CD4 cells in intestinal mucosa
• Due to CCR5 receptors (entry point for HIV)

5.     Progression to AIDS

• Gradual CD4 decline → opportunistic infections

CAUSES & TRANSMISSION

Modes of Transmission:

1. Unprotected sexual contact (vaginal, anal, oral)
2. Blood transfusion (rare due to screening)
3. Sharing contaminated needles/syringes
4. Mother-to-child transmission
• During pregnancy
• Childbirth
• Breastfeeding

DIAGNOSIS

1. Screening Test

• ELISA (Enzyme-Linked Immunosorbent Assay)
• Detects HIV antibodies
• Highly sensitive

Limitations:

• False positives: pregnancy, viral infections, vaccination
• False negatives: early infection (window period)

2. Confirmatory Test

• Western Blot Test

3. Viral Load Tests

• Measure HIV RNA in blood
• Methods:
• PCR (Polymerase Chain Reaction)
• Branched DNA assay

4. CD4 Count

• Normal: 500–1600 cells/mm³
• AIDS: <200 cells/mm³

WHO CLINICAL STAGING

Stage I

• Asymptomatic
• No AIDS

Stage II

• Minor mucocutaneous infections
• Recurrent upper respiratory infections

Stage III

• Chronic diarrhea (>1 month)
• Severe bacterial infections
• Pulmonary tuberculosis

Stage IV (AIDS)

• Opportunistic infections:
• Cerebral toxoplasmosis
• Esophageal candidiasis
• Kaposi’s sarcoma

TREATMENT

Antiretroviral Therapy (ART)

• Combination therapy (HAART)
• Reduces viral load
• Improves CD4 count
• Prevents disease progression

Classes of Anti-HIV Drugs

1.     NRTIs (Nucleoside Reverse Transcriptase Inhibitors)

• Example: Zidovudine, Lamivudine, Tenofovir

2.     NNRTIs (Non-Nucleoside RT Inhibitors)

• Example: Efavirenz, Nevirapine

3.     Protease Inhibitors (PIs)

• Example: Ritonavir, Atazanavir

4.     Entry/Fusion Inhibitors

• Example: Enfuvirtide, Maraviroc

5.     Integrase Inhibitors

• Example: Raltegravir

PREVENTION

1. Safe Sex Practices

• Use condoms
• Limit multiple partners

2. Abstinence

• Most effective prevention

3. Safe Needle Use

• Avoid sharing needles
• Needle exchange programs

4. Blood Safety

• Screening of blood products

5. Healthcare Precautions

• Use PPE (gloves, masks, goggles)
• Proper handling of body fluids

6. Prevention of Mother-to-Child Transmission

• ART during pregnancy
• Safe delivery practices
• Avoid breastfeeding if advised

KEY POINTS FOR EXAMS

• HIV targets CD4+ T cells
• Acute phase = high infectivity
• AIDS defined by CD4 < 200 cells/mm³
• ELISA → screening, Western blot → confirmation
• ART = lifelong treatment
• No cure, but manageable disease

 

 

 

 

SYPHILIS – 

INTRODUCTION

• Syphilis is a chronic sexually transmitted disease caused by
  Treponema pallidum.
• It is a spirochete bacterium (thin, spiral-shaped).
• Disease progresses in stages and can affect multiple organs.
• Common in developing countries, but re-emerging globally.

MODE OF TRANSMISSION

1. Sexual Transmission (Most common)

• Through vaginal, anal, or oral sex
• Entry via broken skin or mucous membranes

2. Non-Sexual Transmission

• Blood transfusion (rare)
• Accidental inoculation
• Mother → fetus (Congenital syphilis)

PATHOGENESIS

• Incubation period: 10–90 days (average 21 days)
• Infection spreads via bloodstream
• Disease progresses in 3 stages:
1. Primary
2. Secondary
3. Tertiary

STAGES OF SYPHILIS

1. Primary Syphilis

• Chancre (classic lesion):
• Painless, firm, round ulcer
• Usually single
• Site: Genitals, mouth, lips
• Associated with regional lymphadenopathy
• Heals in 3–6 weeks (even without treatment)

2. Secondary Syphilis

• Occurs 2–3 months after primary stage
• Highly infectious

Features:

• Generalized rash (palms & soles)
• Non-itching (non-pruritic)
• Mucous patches (silver-grey lesions)
• Lymphadenopathy
• Condyloma lata (moist lesions)

3. Tertiary Syphilis

• Occurs after years (2–3+ years)
• Less infectious but severe damage

Complications:

• Cardiovascular syphilis
• Aortic aneurysm
• Neurosyphilis
• Dementia, paralysis
• Gummas
• Soft necrotic lesions in organs (liver, bone, brain)

CLINICAL FEATURES

Primary Stage

• Painless chancre
• Lymph node enlargement

Secondary Stage

• Rash (palms, soles, trunk)
• Mucous patches
• Fever, malaise

Late Stage

• Organ damage:
• Brain → dementia
• Eyes → blindness
• Heart → aneurysm

CLINICAL MANIFESTATIONS

• Rash
• Fever
• Swollen lymph nodes
• Sore throat
• Headache
• Weight loss
• Muscle aches

DIAGNOSIS

1. Dark-field Microscopy

• Detects motile spirochetes from lesions

2. Serological Tests

Non-treponemal tests

• VDRL (screening)
• RPR

Treponemal tests

• TPHA / TPPA
• FTA-ABS

MANAGEMENT

1. Drug of Choice

• Penicillin (first-line)

2. Treatment Regimens

Early Syphilis

• Benzathine penicillin G
  → 2.4 million units IM (single dose)

Late Syphilis

• Benzathine penicillin G
  → 2.4 million units IM weekly × 3 doses

OR

• Procaine penicillin
  → Daily IM for 17–21 days

3. Alternative Drugs (Penicillin Allergy)

• Doxycycline
• Tetracycline
• Azithromycin
• Erythromycin (least effective)

⚠️ Avoid ceftriaxone in severe penicillin allergy (cross-reactivity risk)

4. Important Treatment Points

• IM route preferred → better bioavailability
• Treat sexual partners
• Screen for other STDs
• Follow-up with serological tests

PREVENTION

• Use of condoms
• Sexual health education
• Awareness in high-risk groups
• Screening:
• Pregnant women
• Avoid sexual contact:
• Until treatment complete
• Until lesions heal
• Partner testing & treatment

COMPLICATIONS

• Neurosyphilis → dementia, paralysis
• Cardiovascular → aortic aneurysm
• Blindness
• Organ damage (liver, bone, brain)

ULTRA-FAST REVISION

• Organism: Treponema pallidum
• Primary lesion: Chancre (painless)
• Most infectious stage: Secondary
• Best test: Dark-field microscopy
• Screening test: VDRL
• Drug of choice: Penicillin
• Early treatment: Single IM dose
• Late treatment: Weekly × 3 doses

 

 

Leprosy

 

LEPROSY (HANSEN’S DISEASE)

INTRODUCTION

·        Leprosy is a chronic infectious disease caused by:

• Mycobacterium leprae
• Mycobacterium lepromatosis

·        It is a slowly progressive granulomatous disease affecting:

• Skin
• Peripheral nerves
• Mucous membranes

·        Incubation period: Months to 40 years

·        Commonly affects cooler parts of the body:

• Eyes
• Nose
• Earlobes
• Hands & feet
• Testes

·        Causes:

• Skin lesions
• Nerve damage
• Deformities

·        Transmission:

• Mainly human-to-human (respiratory droplets)
• Rarely from animals (e.g., armadillos)

·        Discovered by Gerhard Armauer Hansen in 1873

·        WHO reduced prevalence with multidrug therapy (MDT), but still a public health issue in some countries.

CLASSIFICATION OF LEPROSY

1. Paucibacillary (PB) / Tuberculoid

• Few lesions (1–5)
• Hypopigmented or erythematous patches
• Loss of sensation (anesthesia)
• Strong immune response

Nerves commonly affected:

• Great auricular nerve
• Ulnar nerve
• Median nerve
• Radial nerve
• Common peroneal nerve
• Posterior tibial nerve
• Sural nerve

2. Multibacillary (MB) / Lepromatous

·        Numerous lesions (>5)

·        Symmetrical distribution

·        Nodules, plaques

·        Thickened dermis

·        May involve:

• Eyes
• Nose
• Testes
• Bones

·        Features:

• Nasal congestion, epistaxis
• High bacterial load

3. Borderline (Dimorphous)

• Most common form
• Intermediate between PB and MB
• Multiple lesions
• Nerve involvement → weakness + sensory loss

PATHOGENESIS

·        Entry: Respiratory tract

·        Bacilli:

• Invade Schwann cells of nerves
• Also found in macrophages

·        Slow multiplication (12–14 days per division)

Immune response determines disease type:

• Strong cell-mediated immunity (CMI) → PB type
• Weak CMI → MB type

Leprosy reactions:

• Type 1 (reversal reaction)
• Type 2 (erythema nodosum leprosum)

SIGNS AND SYMPTOMS

Skin manifestations

• Hypopigmented or reddish patches
• Loss of sensation
• Dry, thickened skin
• Nodules
• Painless ulcers
• Loss of eyebrows/eyelashes

Nerve involvement

• Numbness
• Muscle weakness/paralysis
• Enlarged peripheral nerves
• Loss of sensation → unnoticed injuries

Mucosal involvement

• Stuffy nose
• Nosebleeds

Advanced disease

• Deformities (hands/feet)
• Shortening of fingers/toes
• Chronic ulcers
• Blindness
• Nose deformity

DIAGNOSIS

Clinical diagnosis

• Hypopigmented patch with sensory loss
• Thickened peripheral nerves

Laboratory tests

• Skin smear:
• Acid-fast bacilli (Ziehl–Neelsen stain)
• Skin biopsy

Additional tests:

• Lepromin test
• PCR
• Liver & kidney function tests
• Nerve biopsy

TREATMENT (WHO MDT)

Paucibacillary (PB)

• Rifampicin
• Dapsone
• Duration: 6–12 months

Multibacillary (MB)

• Rifampicin
• Dapsone
• Clofazimine
• Duration: 12 months or more

Single lesion (WHO recommendation)

• Single-dose therapy:
• Rifampicin + Ofloxacin + Minocycline

Other management

• Steroids → for inflammation & nerve damage
• Early treatment prevents disability

COMPLICATIONS

• Blindness / glaucoma
• Facial deformities
• Infertility (in males)
• Kidney damage
• Claw hand deformity
• Chronic ulcers
• Permanent nerve damage

PREVENTION

·        Early diagnosis and treatment

·        Contact tracing

·        Public awareness

·        Chemoprophylaxis:

• Single-dose rifampicin for close contacts

·        Vaccine:

• No specific vaccine
• BCG gives partial protection

PATHOPHYSIOLOGY (SUMMARY)

·        Spread via nasal droplets

·        Affects:

• Skin
• Peripheral nerves
• Upper respiratory mucosa
• Eyes
• Testes

·        Key mechanism:

• Nerve damage → sensory loss → deformities

 

MALARIA – 

INTRODUCTION

• Malaria is a life-threatening infectious disease caused by protozoa of the genus Plasmodium.
• It is transmitted to humans through the bite of an infected female Anopheles mosquito.
• It is a major tropical disease, especially in developing countries.
• Fever in a patient returning from an endemic area should always raise suspicion of malaria.

ETIOLOGY

Five species infect humans:

1.     Plasmodium falciparum

• Most severe form
• Common in Africa
• Incubation: 7–30 days
• No relapse (no dormant liver stage)

2.     Plasmodium vivax

• Common in Asia & Latin America
• Incubation: ~2 weeks
• Has dormant liver stage (hypnozoites) → relapse

3.     Plasmodium ovale

• Found in West Africa
• Similar to P. vivax (relapsing type)

4.     Plasmodium malariae

• Worldwide distribution
• Incubation: ~18 days
• Causes chronic low-grade infection

5.     Plasmodium knowlesi

• Zoonotic (from monkeys)
• Seen in Southeast Asia
• Rapid and potentially fatal

LIFE CYCLE

Malaria involves two hosts:

• Human (asexual cycle)
• Mosquito (sexual cycle)

1. Sporogonic Cycle (Mosquito)

• Gametocytes → fertilization → zygote
• Zygote → ookinete → oocyst
• Oocyst ruptures → sporozoites → migrate to salivary glands

2. Exo-erythrocytic Cycle (Liver Stage)

• Sporozoites enter liver → form schizonts
• Schizonts release merozoites into blood
• P. vivax & P. ovale form hypnozoites → relapse

3. Erythrocytic Cycle (Blood Stage)

• Merozoites infect RBCs
• Stages:
• Ring form (trophozoite)
• Schizont
• RBC rupture → release of merozoites
• Causes fever and symptoms

Fever periodicity:

• 48 hrs → P. falciparum, vivax, ovale
• 72 hrs → P. malariae
• 24 hrs → P. knowlesi

PATHOPHYSIOLOGY

• RBC destruction → anaemia
• Hemoglobin release → jaundice
• Capillary blockage (esp. falciparum) → organ damage

CLINICAL MANIFESTATIONS

Common Symptoms

• Fever with chills and sweating
• Headache
• Malaise and fatigue
• Nausea, vomiting, diarrhea
• Myalgia and arthralgia

Signs

• Pallor (anaemia)
• Splenomegaly
• Jaundice

SEVERE MALARIA (Medical Emergency)

Commonly due to P. falciparum

• Cerebral malaria (coma, seizures)
• Severe anaemia
• Hypoglycaemia
• Metabolic acidosis
• Acute kidney injury
• ARDS (respiratory distress)
• Shock (hypotension)
• DIC (bleeding disorders)

BLACKWATER FEVER

• Severe complication
• Features:
• Dark/red urine
• Massive hemolysis
• Due to hemoglobinuria

DIAGNOSIS

• Peripheral blood smear (gold standard)
• Rapid antigen tests
• PCR (confirmatory)
• Lab findings:
• Low platelets
• Increased bilirubin
• Anaemia

PREVENTION

• Mosquito control:
• Eliminate stagnant water
• Insecticide spraying
• Personal protection:
• Mosquito nets
• Repellents
• Chemoprophylaxis (travelers)
• Health education

TREATMENT

Antimalarial Drugs

• Chloroquine
• Artemisinin-based combination therapy (ACT)
• Mefloquine
• Primaquine (for relapse prevention)

Combination Therapy

• Artemisinin + lumefantrine
• Atovaquone + proguanil

In Pregnancy

• Quinine + clindamycin
• Artemisinin derivatives (in later stages)

IMPORTANT EXAM POINTS

• Vector: Female Anopheles mosquito
• Infective stage: Sporozoite
• Diagnostic stage: Blood smear
• Relapse: P. vivax & P. ovale
• Severe malaria: P. falciparum