Infection of the heart and acute liver failure are among the rarer complications.A pregnant woman who develops dengue is at higher risk of miscarriage, low birth weight birth, and premature birth. Cause
Virology
Dengue fever virus (DENV) is an RNA virus of the family Flaviviridae; genus Flavivirus. Other members of the same genus include yellow fever virus, West Nile virus, Zika virus, St. Louis encephalitis virus, Japanese encephalitis virus, tick-borne encephalitis virus, Kyasanur forest disease virus, and Omsk hemorrhagic fever virus. Most are transmitted by arthropods (mosquitos or ticks), and are therefore also referred to as arboviruses (arthropod-borne viruses).The dengue virus genome (genetic material) contains about 11,000 nucleotide bases, which code for the three different types of protein molecules (C, prM and E) that form the virus particle and seven other non-structural protein molecules (NS1, NS2a, NS2b, NS3, NS4a, NS4b, NS5) that are found in infected host cells only and are required for replication of the virus. There are five strains of the virus, called serotypes, of which the first four are referred to as DENV-1, DENV-2, DENV-3 and DENV-4. The fifth type was announced in 2013. The distinctions between the serotypes are based on their antigenicity. Transmission
Dengue virus is primarily transmitted by Aedes mosquitos, particularly A. aegypti. These mosquitos usually live between the latitudes of 35° North and 35° South below an elevation of 1,000 metres (3,300 ft). They typically bite during the early morning and in the evening, but they may bite and thus spread infection at any time of day.
If chemosis has occurred due to excessive rubbing of the eye, the first aid to be given is a cold water wash for eyes.Other causes of chemosis include:

Superior vena cava obstruction, accompanied by facial oedema
Hyperthyroidism, associated with exophthalmos, periorbital puffiness, lid retraction, and lid lag
Cavernous sinus thrombosis, associated with infection of the paranasal sinuses, proptosis, periorbital oedema, retinal haemorrhages, papilledema, extraocular movement abnormalities, and trigeminal nerve sensory loss
Carotid-cavernous fistula - classic triad of chemosis, pulsatile proptosis, and ocular bruit
Cluster headache
Trichinellosis
Systemic lupus erythematosus (SLE)
Angioedema
Acute glaucoma
Panophthalmitis
Orbital cellulitis
Gonorrheal conjunctivitis
Dacryocystitis
Spitting cobra venom to the eye
High concentrations of phenacyl chloride in chemical mace spray
Urticaria
Trauma
HSV Keratitis
Post surgical
Mucor
Rhabdomyosarcoma of the orbit

Diagnosis
An eye doctor may most often diagnose chemosis by doing a physical examination of the affected area. They can also ask questions about the severity and length of other symptoms. Treatment
Treatment depends on the cause of the chemosis. References


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