Via O Globo: Cidade do Rio tem o primeiro caso de dengue tipo 4. [City of Rio has first case of type 4 dengue] Excerpt, with my translation:
A cidade do Rio registrou o primeiro caso de dengue do tipo 4, conforme noticiou na sexta-feira a coluna de Ancelmo Gois no GLOBO.
The city of Rio has recorded its first case of type 4 dengue, according to a Globo column by Ancelmo Gois this Friday.
Segundo a Secretaria municipal de Saúde, o caso aconteceu na Zona Oeste. Especialistas ouvidos pelo GLOBO disseram que o tipo 4 não é mais nocivo que os demais — 1, 2 e 3 —, mas preocupa pelo fato de a maioria da população não estar imunizada contra ele. Quem já teve a doença não é contaminado pelo mesmo tipo de vírus. E o Brasil estava livre da dengue 4 há quase 30 anos.
According to the Municipal Secretariat of Health, the case was found in the West Zone. Specialists interviewed by O Globo said that type 4 is not worse than the others—1, 2 and 3—but they are worried by the fact that most of the population lacks immunity to the strain. Those who now have the illness are not infected with the same type. And Brazil was free of dengue 4 for almost 30 years.
In other words, people who have fallen ill from one of the other types are likely to become very dangerously ill if they are infected with type 4.



