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Primary lesion classically associated with acquired syphilis; appearance alone does not establish the diagnosis.

A genital ulcer disease distinct from syphilis.

Involvement of the nervous system by syphilis; it is not confined to a single chronological stage.

General paresis combines progressive mental deterioration with a characteristic disorder of speech, fine movement and motor control. The historical phrase “general paralysis of the insane” does not mean complete, simultaneous immobility of every muscle.

Early changes may include impaired judgment, forgetfulness, altered personality, irritability, inappropriate confidence and loss of ordinary social restraint. Expansive or grandiose delusions are characteristic in some cases, but depression, suspiciousness or less spectacular cognitive failure can occur. Increasing dementia and reduced insight are more fundamental than any one extravagant belief.

The physical examination may disclose hesitating or slurred articulation, tremulous lips and tongue, facial tremor, deteriorating handwriting and impaired coordination of the hands. Gait becomes unsteady and weakness advances. Unequal or abnormally reacting pupils, altered reflexes and seizures may occur. Later disease can bring severe cognitive incapacity, swallowing difficulty, incontinence and dependence. Mental and motor manifestations need not develop in a fixed order or with equal severity.^[ref]

The name general paresis was already advocated in a January 1864 pathological study to avoid the ambiguity of “general paralysis.”^[ref] Modern medicine recognises the classical disease as a form of neurosyphilis, involving chronic injury to the brain. This causal diagnosis should be separated from the historical clinical label; it was not securely established by the wording of an 1864 examination. Syphilis serology, relevant cerebrospinal fluid findings and exclusion of alternative causes now help establish the diagnosis.^[ref]

Several mimics deserve explicit comparison. Mania can resemble the expansive mental phase, and depression or psychotic illness can resemble other presentations, but a sustained progressive combination of cognitive decline, characteristic speech disturbance and neurological signs argues for organic disease. Alcohol intoxication can produce tremor, slurred speech and an unsteady gait; an acute time course or improvement with clearance differs from progressive general paresis, although chronic alcohol-related disease may complicate the distinction. Other dementias, chronic cerebral vascular disease, tumours and some toxic or metabolic disorders can likewise combine cognitive and motor abnormalities.

A focal stroke generally gives a more abrupt and lateralised deficit; a series of strokes can produce a stepwise course. Parkinsonism can impair speech and gait but has a different predominant motor pattern. Tabes dorsalis can produce marked sensory ataxia, absent tendon reflexes and bladder disturbance with relatively preserved intellect; it can also coexist with paretic disease. The diagnosis rests on the pattern, course and corroborating investigation, not on grandiosity or a tremulous tongue alone.^[ref]

Infantile syphilis, varicella, modified smallpox and ordinary smallpox are distinguished by the whole illness: age and history, prodrome, distribution, lesion depth, successive crops and the speed of evolution. No isolated “spot” supplies an infallible diagnosis. Varioloid is the historical name for modified smallpox, particularly after vaccination; it is not a synonym for varicella.

In an infant, the relevant syphilis is chiefly congenital syphilis, transmitted during pregnancy. It can be unapparent at birth and declare itself later with persistent nasal discharge or “snuffles,” poor growth, fissuring near the mouth, a copper-coloured maculopapular or peeling eruption, and lesions on palms and soles. Bullae or pustular appearances can occur. Associated hepatosplenomegaly, jaundice and painful bone disease support a systemic process rather than a simple crop of transient vesicles. The eruption is not required to pass synchronously through the stereotyped smallpox sequence. Maternal infection and appropriate serology matter; absence of a rash at birth does not exclude infection.^[ref][ref]

Varicella, or chickenpox, typically produces delicate superficial itchy vesicles on a red base, especially on the anatomical trunk, with successive crops. Consequently fresh papules, vesicles and crusts coexist in one area. In children the preceding illness is often mild or absent. Individual lesions evolve quickly, and ordinary superficial lesions usually heal without the deep pitting associated with destructive smallpox lesions, although secondary infection can scar. The distribution is generally centripetal rather than most dense on the distal limbs; palms and soles are much less commonly affected.^[ref]

Ordinary variola, or smallpox, classically begins with a marked febrile prodrome, often including headache, backache and prostration, before the rash. Lesions favour the face and extremities, can affect palms and soles, and proceed through firm papules to deep-seated vesicles and pustules, often with central depression. Within a given region they are relatively alike in developmental stage. The lesions evolve over days rather than the rapid successive crops of varicella; crusting and separation may leave depressed scars. Severe confluent, flat or haemorrhagic forms depart from the uncomplicated textbook pattern, so the absence of perfect pustules is not a universal exclusion.^[ref][ref]

Varioloid retains the cause of smallpox but has a modified course. Prior vaccination can yield fewer and more superficial lesions, faster evolution and less secondary fever. The prodrome can still be substantial. Sparse lesions and shortened evolution can resemble chickenpox, so vaccination history and the entire time course help, but neither a vaccination scar nor mild disease proves the diagnosis. Varioloid and variola belong on a spectrum of the same infection, whereas varicella is caused by a different virus.^[ref]

Thus the characteristic contrast is persistent multisystem infantile infection for congenital syphilis, superficial lesions in mixed-stage crops for varicella, deeper regionally synchronous lesions with a severe preceding fever for ordinary smallpox, and attenuation of the latter pattern for varioloid. Current confirmation uses tests appropriate to the suspected organism; the historical clinical distinctions remain valuable descriptions, but they do not replace modern laboratory confirmation.

In 1865 Mercury was the principal systemic remedy for early constitutional syphilis, while potassium iodide was especially associated with later destructive lesions; neither is an acceptable substitute for modern penicillin therapy. Historical classifications depended chiefly on clinical appearance, before identification of Treponema pallidum and modern serology.

For a primary indurated chancre, period treatment combined cleanliness, protection from friction and irritant discharges, and, in mercurial practice, a prolonged course of a Mercury preparation. Administration could be by mouth or by rubbing an ointment into the skin; some practitioners used fumigation. Local cauterisation of a sore could not be assumed to remove infection already spread beyond it. Painful soft sores and suppurating groin swellings were often discussed among venereal diseases, but modern chancroid is distinct from syphilis; an 1865 “variety” cannot automatically be assigned the same cause or treatment.^[ref]

In secondary disease, with generalised eruptions and mucosal lesions, Mercury was used in carefully watched courses, with food, hygiene and local care. Blue pill, grey powder and other mercurial compounds were alternative forms, not interchangeable quantities. Stomatitis, excessive salivation, bowel disturbance and constitutional deterioration were reasons to interrupt treatment, not desirable signs of cure. Relapse after apparent healing was recognised. For later gummatous syphilis, painful periosteal swellings, ulceration and some nervous manifestations, potassium iodide, sometimes combined with a mercurial, was a characteristic period choice. Apparent symptomatic improvement did not demonstrate eradication of the infection.^[ref][ref]

Congenital disease also received mercurial treatment in the period, together with attention to feeding and the mother. That history must be separated from present management: congenital syphilis results from maternal infection, not an inherited constitutional taint. Maternal treatment, infant examination and laboratory evaluation determine modern management; an affected infant can require a full course of parenteral penicillin even without obvious external lesions.^[ref]

Modern early acquired syphilis, including primary, secondary and early latent disease, is ordinarily treated with benzathine penicillin G, 2.4 million units intramuscularly once in adults. Late latent disease or disease of unknown duration ordinarily requires three weekly 2.4-million-unit injections. Neurosyphilis, ocular disease and otic disease require a regimen with appropriate tissue penetration, ordinarily aqueous crystalline penicillin G, 18–24 million units per day intravenously for 10–14 days, rather than the single early-disease injection. Pregnancy, allergy, congenital disease and other special circumstances need the corresponding specialist pathway. Clinical and quantitative serological follow-up, partner management and assessment for coexisting infections are part of treatment. The stage labels guide management, but nervous, ocular or auditory involvement can occur at more than one stage.^{[ref][ref][ref]}

Early congenital syphilis can affect the skin, mucosa, bones, viscera and nervous system, yet an infected infant may look well at birth. The symptoms are a variable constellation, not a compulsory sequence seen in every child.

The classical infantile picture includes persistent nasal discharge or “snuffles”, difficulty feeding, poor growth and a rash that can involve the palms and soles. The eruption may be maculopapular or blistering, with desquamation; colour descriptions such as “coppery” are neither universal nor diagnostic alone. Fissures around the mouth and other mucocutaneous lesions may occur. Look also for hepatosplenomegaly, jaundice, anaemia, enlarged lymph nodes and evidence of systemic illness.^[ref]

Bone disease is particularly important when interpreting an apparently motionless limb. Osteochondritis or periostitis can make movement painful, producing pseudoparalysis. This is distinct from the loss of motor function discussed under infantile paralysis. The nervous system can also be involved, including meningitis or seizures. Severe disease can be associated with prematurity, hydrops, stillbirth or neonatal death, although a living infant with mild signs may present much later.^[ref]

The period term “hereditary syphilis” should not be read as a modern account of Mendelian inheritance. Modern science identifies infection by Treponema pallidum, transmitted to the fetus during pregnancy, rather than an inherited constitutional taint. Absence of obvious maternal symptoms does not exclude transmission. Equally, a rash or nasal discharge alone is not enough to prove syphilis or justify an allegation about a parent's behaviour.^[ref]

Later disease is useful for completing the history, but is not the usual neonatal picture. It can include notched permanent incisors or abnormal molars, a saddle-shaped nose, anterior bowing of the shins, interstitial keratitis and sensorineural hearing loss. These permanent dental signs cannot be demanded of a young infant before the relevant teeth have developed.^[ref]

Modern correction: examine and test in the context of maternal infection and treatment, even when the baby has no symptoms. Infant and maternal quantitative nontreponemal results, examination, treatment history and selected direct or additional tests guide assessment. Passive maternal antibodies complicate interpretation of infant serology; a positive test does not have the same meaning in every setting. Appropriate penicillin treatment and follow-up are determined by the clinical scenario, not by waiting for a characteristic rash. Historical mercurial treatment is not its modern substitute.^[ref]