Many people who present with secondary syphilis (40–85% of women, 20–65% of men) do not report previously having had the classical chancre of primary syphilis. Latent
Latent syphilis is defined as having serologic proof of infection without symptoms of disease. It develops after secondary syphilis and is divided into early latent and late latent stages. Early latent syphilis is defined by the World Health Organization as less than 2 years after original infection. Early latent syphilis is infectious as up to 25% of people can develop a recurrent secondary infection (during which spirochetes are actively replicating and are infectious). Two years after the original infection the person will enter late latent syphilis and is not as infectious as the early phase. The latent phase of syphilis can last many years after which, without treatment, approximately 15-40% of people can develop tertiary syphilis. Tertiary
Tertiary syphilis may occur approximately 3 to 15 years after the initial infection, and may be divided into three different forms: gummatous syphilis (15%), late neurosyphilis (6.5%), and cardiovascular syphilis (10%). Without treatment, a third of infected people develop tertiary disease. People with tertiary syphilis are not infectious.Gummatous syphilis or late benign syphilis usually occurs 1 to 46 years after the initial infection, with an average of 15 years. This stage is characterized by the formation of chronic gummas, which are soft, tumor-like balls of inflammation which may vary considerably in size. They typically affect the skin, bone, and liver, but can occur anywhere.Cardiovascular syphilis usually occurs 10–30 years after the initial infection.
Chemical pneumonitis is inflammation of the lung caused by aspirating or inhaling irritants. It is sometimes called a "chemical pneumonia", though it is not infectious. There are two general types of chemical pneumonitis: acute and chronic. Irritants capable of causing chemical pneumonitis include vomitus, barium used in gastro-intestinal imaging, chlorine gas (among other pulmonary agents), ingested gasoline or other petroleum distillates, ingested or skin absorbed pesticides, gases from electroplating, smoke and others. It may also be caused by the use of inhalants. Mendelsons syndrome is a type of chemical pneumonitis. Mineral oil should not be given internally to young children, pets, or anyone with a cough, hiatal hernia, or nocturnal reflux, because it can cause complications such as lipoid pneumonia. Due to its low density, it is easily aspirated into the lungs, where it cannot be removed by the body. In children, if aspirated, the oil can work to prevent normal breathing, resulting in death of brain cells and permanent paralysis and/or brain damage. Signs and symptoms
Acute:

Cough
Difficulty Breathing
Abnormal lung sounds (wet or gurgling sounds when breathing)
Chest pain, tightness or burning sensationChronic:

Persistent cough
Shortness of breath
Increased susceptibility to respiratory illnessSymptoms of chronic chemical pneumonitis may or may not be present, and can take months or years to develop to the point of noticeability. Diagnosis
The pragmatic challenge is to distinguish from aspiration pneumonia with an infectious component because the former does not require antibiotics while the latter does.