found some answer on http://www.cpmc.org/advanced/liver/patients/topics/hepd.html
Coinfection with Hepatitis B and D: the serologic course of HDV infection varies depending on whether the virus is acquired as a coinfection with HBV or as a superinfection of a person with chronic HBV infection. In most persons with HBV-HDV coinfection, both IgM antibody to HDV (anti-HDV) and IgG anti-HDV are detectable during the course of infection. However, in about 15% of patients, the only evidence of HDV infection may be the detection of either IgM anti-HDV alone during the early acute period of illness or IgG anti-HDV alone during convalescence.
Supercoinfection with Hepatitis B and D: Typical Serologic Course: In patients with chronic HBV infection who are superinfected with HDV, several characteristic serologic features generally occur, including: The concentration of HBsAg declines at the time HDAg appears in the serum; HDAg and HDV RNA remain detectable in the serum because chronic HDV infection generally occurs in most patients with HDV superinfection, unlike the case with coinfection; High concentration of both IgM and IgG anti-HDV are detectable, which persist indefinitely.
So, this can be translated that "Anti HDV IgM = negative" means that no Supercoinfection with Hepatitis B and D exist but to eliminate also Coinfection is need that IgG anti-HDV to be tested.
also http://www.kenes.com/easl2010/posters/Abstract209.htm spoke about the correlation of Anti-HDV-IgM with disease activity
"Conclusions: Anti-HDV-IgM levels correlate with disease activity in patients with delta hepatitis and may indicate stronger immune responses against HDV. Anti-HDV-IgM ODs decline during successful PegIFNa-based treatment and high baseline values may be predictive for treatment response. "
what Anti-HDV-IgM ODs means ? (i have the impression that Anti-HDV-IgM and Anti-HDV-IgM ODs are different)
also for hepatitis markers a good link is:
it is stat that "in a self limited HBV/HDV co-infection Anti-HDV-IgM antibodies frequently represent the only marker of infection"
What is self limited HBV/HDV co-infection ?
I'm still puzzled regarding the Anti-HDV-IgM test result.
anti hdv igm
anti hdv igg
thse are all the tests to do so no worries